Joseph "saw a bright light enter the room where he lay he looked up and saw an angel of the Lord standing by him. The angel spoke ... There is a record for you but you cannot get it until you learn to keep the commandments of God, for it is not to get gain. But it is to bring forth that light and intelligence which has been long lost in the Earth 

Now Joseph beware or when you go to get the plates your mind will be filled with darkness and all manner of evil will rush into your mind to prevent you from keeping the commandments of God that you may not succeed in doing his work and you must tell your father of this for he will believe every word you say. 

The record is on a side hill on the Hill of Cumorah 3 miles from this place remove the Grass and moss and you will find a large flat stone pry that up and you will find the record under it laying on 4 pillars of cement— then the angel left him.

"This Book, which contained these things, was hid in the earth by Moroni, in a hill called by him, Cumorah, which hill is now in the State of New York, near the village of Palmyra, in Ontario County.

"In that neighborhood there lived a young man named Joseph Smith, who prayed to the Great Spirit much, in order that he might know the truth; and the Great Spirit sent an angel to him, and told him where this Book was hid by Moroni; and commanded him to go and get it. He accordingly went to the place, and dug in the earth, and found the Book written on golden plates.

"But it was written in the language of the forefathers of the red man; therefore this young man, being a pale face, could not understand it; but the angel told him and showed him, and gave him knowledge of the language, and how to interpret the Book. So he interpreted it into the language of the pale faces, and wrote it on paper, and caused it to be printed, and published thousands of copies of among them; and then sent us to the red men to bring some copies of it to them, and to tell them this news. So we have now come from him, and here is a copy of the Book, which we now present to our red friend, the chief of the Delawares, and which we hope he will cause to be read and known among his tribe; it will do them good."

We then presented him with a Book of Mormon.

There was a pause in the council, and some conversation in their own tongue, after which the chief made the following reply: "We feel truly thankful to our white friends who have come so far, and been at such pains to tell us good news, and especially this new news concerning the Book of our forefathers; it makes us glad in here"—placing his hand on his heart.

Autobiography of Parley P. Pratt, page 58 of Chapter VIII. 

https://archive.org/details/autobiographyofp00prat/page/58/mode/2uphttps://archive.org/details/autobiographyofp00prat/page/58/mode/2up 

On the evening of the 21st of September, 1823, previous to retiring to rest, our brother’s mind was unusually wrought up on the subject which had so long agitated his mind—his heart was drawn out in fervent prayer, and his whole soul was so lost to every thing of a temporal nature, that earth, to him, had lost its charms, and all he desired was to be prepared in heart to commune with some kind messenger who could communicate to him the desired information of his acceptance with God.

At length the family retired, and he, as usual, bent his way, though in silence, where others might have rested their weary frames “locked fast in sleep’s embrace;” but repose had fled, and accustomed slumber had spread her refreshing hand over others beside him—he continued still to pray—his heart, though once hard and obdurate, was softend, and that mind which had often flitted, like the “wild bird of passage,” had settled upon a determined basis not to be decoyed or driven from its purpose.

In this situation hours passed unnumbered—how many or how few I know not, neither is he able to inform me; but supposes it must have been eleven or twelve, and perhaps later, as the noise and bustle of the family, in retiring, had long since ceased.— 

While continuing in prayer for a manifestation in some way that his sins were forgiven; endeavoring to exercise faith in the scriptures, on a sudden a light like that of day, only of a purer and far more glorious appearance and brightness, burst into the room.— 

Indeed to use his own description, the first sight was as though the house was filled with consuming and unquenchable fire. This sudden appearance of a light so bright, as must naturally be expected, occasioned a

shock or sensation, visible to the extremities of the body. It was, however, followed with a calmness and serenity of mind, and an overwhelming rapture of Joy that surpassed understanding, and in a moment a personage stood before him.

Notwithstanding the room was previously filled with light above the brightness of the sun, as I before describe​d, yet there seemed to be an additional glory surrounding or accompanying this personage, which shone with an increased degree of brilliancy, of which he was in the midst; and though his countenance was as lightning, yet it was of a pleasing, innocent and glorious appearance, so much so, that every fear was banished from the heart, and nothing but calmness pervaded the soul.

It is no easy task to describe the appearance of a messenger from the skies...

The stature of this personage was a little above the common size of men in this age; his garment was perfectly white, and had the appearance of being without seam.

Though fear was banished from his heart, yet his surprise was no less when he heard him declare himself to be a messenger sent by commandment of the Lord, to deliver a special message and to witness to him that his sins were forgiven, and that his prayers were heard; and that the scriptures might be fulfilled, which say— “God has chosen the foolish things of the world to confound the things which are mighty; and base things of the world, and things which are despised, has God chosen; yea, and things which are not, to bring to nought things which are that no flesh should glory in his presence. Therefore, says the Lord, I will proceed to do a marvelous work among this people, even a marvelous work and a wonder; the wisdom of their wise shall perish, and the understanding of their prudent shall be hid; for according to his covenant which he made with his ancient saints, his people, the house of Israel must come to a knowledge of the gospel, and own that Messiah whom their fathers rejected, and with them the fulness of the Gentiles be gathered in, to rejoice in one fold under one Shepherd”.

"This cannot be brought about until first certain preparatory things are accomplished, for so has the Lord purposed in his own mind. He has therefore chosen you as an instrument in his hand to bring to light that which shall perform his act, his strange act, and bring to pass a marvelous work and a wonder. Wherever the sound shall go it shall cause the ears of men to tingle, and wherever it shall be proclaimed, the pure in heart shall rejoice, while those who draw near to God with their mouths, and honor him with their lips, while their hearts are far from him, will seek its overthrow, and the destruction of those by whose hands it is carried. Therefore, marvel not if your name is made a derision, and had as a by-word among such, if you are the instrument in bringing it, by the gift of God, to the knowledge of the people.”

He then proceeded and gave a general account of the promises made to the fathers, and also gave a history of the aborigines of this country, and said they were literal descendants of Abraham.

He represented them as once being an enlightened and intelligent people, possessing a correct knowledge of the gospel, and the plan of restoration and redemption. 

He said this history was written and deposited not far from that place, and that it was our brother’s privilege, if obedient to the commandments of the Lord, to obtain and translate the same by the means of the Urim and Thummim, which were deposited for that purpose with the record....

While describing the place where the record was deposited, he gave a minute relation of it, and the vision of his mind being opened at the same time, he was permitted to view it critically; and previously being acquainted with the place, he was able to follow the direction of the vision, afterward, according to the voice of the angel, and obtain the book.

On the evening of the 21st of September, A. D. 1823, while I was praying unto God, and endeavoring to exercise faith in the precious promises of scripture on a sudden a light like that of day, only of a far purer and more glorious appearance, and brightness burst into the room, indeed the first sight was as though the house was filled with consuming fire; the appearance produced a shock that affected the whole body; in a moment a personage stood before me surrounded with a glory yet greater than that with which I was already surrounded. This messenger proclaimed himself to be an angel of God sent to bring the joyful tidings, that the covenant which God made with ancient Israel was at hand to be fulfilled, that the preparatory work for the second coming of the Messiah was speedily to commence; that the time was at hand for the gospel, in all its fulness to be preached in power, unto all nations that a people might be prepared for the millennial reign.

I was informed that I was chosen to be an instrument in the hands of God to bring about some of his purposes in this glorious dispensation.

I was also informed concerning the aboriginal inhabitants of this country, and shown who they were, and from whence they came; a brief sketch of their origin, progress, civilization, laws, governments, of their righteousness and iniquity, and the blessings of God being finally withdrawn from them as a people was made known unto me: I was also told where there was deposited some plates on which were engraven an abridgement of the records of the ancient prophets that had existed on this continent. The angel appeared to me three times the same night and unfolded the same things. After having received many visits from the angels of God unfolding the majesty, and glory of the events that should transpire in the last days, on the morning of the 22d of September A. D. 1827, the angel of the Lord delivered the records into my hands.

These records were engraven on plates which had the appearance of gold, each plate was six inches wide and eight inches long and not quite so thick as common tin. They were filled with engravings, in Egyptian characters and bound together in a volume, as the leaves of a book with three rings running through the whole. The volume was something near six inches in thickness, a part of which was sealed. The characters on the unsealed part were small, and beautifully engraved. The whole book exhibited many marks of antiquity in its construction and much skill in the art of engraving. With the records was found a curious instrument which the ancients called “Urim and Thummim,” which consisted of two transparent stones set in the rim of a bow fastened to a breastplate.

Through the medium of the Urim and Thummim I translated the record by the gift, and power of God.

In this important and interesting book the history of ancient America is unfolded, from its first settlement by a colony that came from the tower of Babel, at the confusion of languages to the beginning of the fifth century of the Christian era. We are informed by these records that America in ancient times has been inhabited by two distinct races of people. The first were called Jaredites and came directly from the tower of Babel. The second race came directly from the city of Jerusalem, about six hundred years before Christ. They were principally Israelites, of the descendants of Joseph. The Jaredites were destroyed about the time that the Israelites came from Jerusalem, who succeeded them in the inheritance of the country. The principal nation of the second race fell in battle towards the close of the fourth century.

The remnant are the Indians that now inhabit this country. 

This book also tells us that our Saviour made his appearance upon this continent after his resurrection,

29 In consequence of these things, I often felt condemned for my weakness and imperfections; when, on the evening of the above-mentioned twenty-first of September, after I had retired to my bed for the night, I betook myself to prayer and supplication to Almighty God for forgiveness of all my sins and follies, and also for a manifestation to me, that I might know of my state and standing before him; for I had full confidence in obtaining a divine manifestation, as I previously had one.

30 While I was thus in the act of calling upon God, I discovered a light appearing in my room, which continued to increase until the room was lighter than at noonday, when immediately a personage appeared at my bedside, standing in the air, for his feet did not touch the floor.

31 He had on a loose robe of most exquisite whiteness. It was a whiteness beyond anything earthly I had ever seen; nor do I believe that any earthly thing could be made to appear so exceedingly white and brilliant. His hands were naked, and his arms also, a little above the wrist; so, also, were his feet naked, as were his legs, a little above the ankles. His head and neck were also bare. I could discover that he had no other clothing on but this robe, as it was open, so that I could see into his bosom.

32 Not only was his robe exceedingly white, but his whole person was glorious beyond description, and his countenance truly like lightning. The room was exceedingly light, but not so very bright as immediately around his person. When I first looked upon him, I was afraid; but the fear soon left me.

33 He called me by name, and said unto me that he was a messenger sent from the presence of God to me, and that his name was Moroni; that God had a work for me to do; and that my name should be had for good and evil among all nations, kindreds, and tongues, or that it should be both good and evil spoken of among all people.

34 He said there was a book deposited, written upon gold plates, giving an account of the former inhabitants of this continent, and the source from whence they sprang. He also said that the fulness of the everlasting Gospel was contained in it, as delivered by the Savior to the ancient inhabitants;

35 Also, that there were two stones in silver bows—and these stones, fastened to a breastplate, constituted what is called the Urim and Thummim—deposited with the plates; and the possession and use of these stones were what constituted “seers” in ancient or former times; and that God had prepared them for the purpose of translating the book.

(Joseph Smith—History 1:29–35)

up to the time when he took it​ out of the ​cement box in the hill of cumorah which took place the mor[n]ing that Mr Knight [Joseph Knight Sr.] missed his horse and waggon 

when ​Joseph took the plates into his hands at this time the angel of the Lord stood by and said now you have got the record into your own hands and you are but a man therefore you will have to be watchful and faithful to your trust or you will be overpowered by wicked men for they will lay every plan and scheme that is possible to get them away from you and if you do not take heed continually they will succeed while they were in my hands I could keep them and no man had power <​to take​> them away but now I give them up to you beware and look well to your ways— <​and you shall have power to keep <​retain​> them until the time for them to be translated​> 

The thing which spoke of it had that Joseph termed a Key was indeed nothing more nor less than a urim and Thummim by which the angel manifested those things to <​him​> that were shown him in vision by the which also he could at any time ascertain the approach of danger Either to himself or the record and for this cause he kept these things constantly about his person