The Book of Jacob in the Book of Mormon explains much about why the Book of Mormon was compiled. Jacob was a prophet in the Americas around 540 B.C. The following scriptures are from Jacob.
“Wherefore, thus saith the Lord, I have led this people forth out of the land of Jerusalem, by the power of mine arm, that I might raise up unto me a righteous branch from the fruit of the loins of Joseph” (Jacob 2:25).
Since the Book of Mormon peoples were Israelites, the Lord continued to send prophets among them. Following the Lord’s command, the people lived according to the Law of Moses looking forward to the coming of Christ. The Book of Mormon prophets testified that all the prophets since the beginning of time testified and taught of Jesus Christ. Most of those references have been deleted from the Old Testament that is currently had today among Jews and Christians. The 4th chapter of Jacob explains the beliefs of the Book of Mormon people very clearly:
THE BOOK OF JACOB
THE BROTHER OF NEPHI
All the prophets worshipped the Father in the name of Christ—Abraham’s offering of Isaac was in similitude of God and his Only Begotten—Men should reconcile themselves to God through the atonement—The Jews shall reject the foundation stone. Between 544 and 421 B.C.
1 Now behold, it came to pass that I, Jacob, having ministered much unto my people in word, (and I cannot write but a little of my words, because of the difficulty of engraving our words upon plates) and we know that the things which we write upon plates must remain;
2 But whatsoever things we write upon anything save it be upon plates must perish and vanish away; but we can write a few words upon plates, which will give our children, and also our beloved brethren, a small degree of knowledge concerning us, or concerning their fathers—
3 Now in this thing we do rejoice; and we labor diligently to engraven these words upon plates, hoping that our beloved brethren and our children will receive them with thankful hearts, and look upon them that they may learn with joy and not with sorrow, neither with contempt, concerning their first parents.
4 For, for this intent have we written these things, that they may know that we knew of Christ, and we had a hope of his glory many hundred years before his coming; and not only we ourselves had a hope of his glory, but also all the holy prophets which were before us.
5 Behold, they believed in Christ and worshiped the Father in his name, and also we worship the Father in his name. And for this intent we keep the law of Moses, it pointing our souls to him; and for this cause it is sanctified unto us for righteousness, even as it was accounted unto Abraham in the wilderness to be obedient unto the commands of God in offering up his son Isaac, which is a similitude of God and his Only Begotten Son.
6 Wherefore, we search the prophets, and we have many revelations and the spirit of prophecy; and having all these witnesses we obtain a hope, and our faith becometh unshaken, insomuch that we truly can command in the name of Jesus and the very trees obey us, or the mountains, or the waves of the sea.
7 Nevertheless, the Lord God showeth us our weakness that we may know that it is by his grace, and his great condescensions unto the children of men, that we have power to do these things.
8 Behold, great and marvelous are the works of the Lord. How unsearchable are the depths of the mysteries of him; and it is impossible that man should find out all his ways. And no man knoweth of his ways save it be revealed unto him; wherefore, brethren, despise not the revelations of God.
9 For behold, by the power of his word man came upon the face of the earth, which earth was created by the power of his word. Wherefore, if God being able to speak and the world was, and to speak and man was created, O then, why not able to command the earth, or the workmanship of his hands upon the face of it, according to his will and pleasure?
10 Wherefore, brethren, seek not to counsel the Lord, but to take counsel from his hand. For behold, ye yourselves know that he counseleth in wisdom, and in justice, and in great mercy, over all his works.
11 Wherefore, beloved brethren, be reconciled unto him through the atonement of Christ, his Only Begotten Son, and ye may obtain a resurrection, according to the power of the resurrection which is in Christ, and be presented as the first-fruits of Christ unto God, having faith, and obtained a good hope of glory in him before he manifesteth himself in the flesh.
12 And now, beloved, marvel not that I tell you these things; for why not speak of the atonement of Christ, and attain to a perfect knowledge of him, as to attain to the knowledge of a resurrection and the world to come?
13 Behold, my brethren, he that prophesieth, let him prophesy to the understanding of men; for the Spirit speaketh the truth and lieth not. Wherefore, it speaketh of things as they really are, and of things as they really will be; wherefore, these things are manifested unto us plainly, for the salvation of our souls. But behold, we are not witnesses alone in these things; for God also spake them unto prophets of old.
14 But behold, the Jews were a stiffnecked people; and they despised the words of plainness, and killed the prophets, and sought for things that they could not understand. Wherefore, because of their blindness, which blindness came by looking beyond the mark, they must needs fall; for God hath taken away his plainness from them, and delivered unto them many things which they cannot understand, because they desired it. And because they desired it God hath done it, that they may stumble.
15 And now I, Jacob, am led on by the Spirit unto prophesying; for I perceive by the workings of the Spirit which is in me, that by the stumbling of the Jews they will reject the stone upon which they might build and have safe foundation.
16 But behold, according to the scriptures, this stone shall become the great, and the last, and the only sure foundation, upon which the Jews can build.
17 And now, my beloved, how is it possible that these, after having rejected the sure foundation, can ever build upon it, that it may become the head of their corner?
18 Behold, my beloved brethren, I will unfold this mystery unto you; if I do not, by any means, get shaken from my firmness in the Spirit, and stumble because of my over anxiety for you.
A Voice out of the Dust
Mormon, one of the last prophets to the Book of Mormon peoples, compiled the records of the former prophets. He was directed by the Lord in doing so. The Lord meant the Book of Mormon to come forth out of the dust to the Gentiles, who would eventually carry it to the Jews. It contains many warnings for our day, as well as much clear doctrine. It is another testament of Christ — that He is the Only Begotten of God and our Savior and Redeemer. This, because He visited this remnant of Joseph after His resurrection. Note the following scriptures from Moroni, Mormon’s son, and the last living prophet of a destroyed people:
23 Yea, behold I say unto you, that those saints who have gone before me, who have possessed this land, shall cry, yea, even from the dust will they cry unto the Lord; and as the Lord liveth he will remember the covenant which he hath made with them.
24 And he knoweth their prayers, that they were in behalf of their brethren. And he knoweth their faith, for in his name could they remove mountains; and in his name could they cause the earth to shake; and by the power of his word did they cause prisons to tumble to the earth; yea, even the fiery furnace could not harm them, neither wild beasts nor poisonous serpents, because of the power of his word.
25 And behold, their prayers were also in behalf of him that the Lord should suffer to bring these things forth.
26 And no one need say they shall not come, for they surely shall, for the Lord hath spoken it; for out of the earth shall they come, by the hand of the Lord, and none can stay it; and it shall come in a day when it shall be said that miracles are done away; and it shall come even as if one should speak from the dead.
27 And it shall come in a day when the blood of saints shall cry unto the Lord, because of secret combinations and the works of darkness.
28 Yea, it shall come in a day when the power of God shall be denied, and churches become defiled and be lifted up in the pride of their hearts; yea, even in a day when leaders of churches and teachers shall rise in the pride of their hearts, even to the envying of them who belong to their churches.
29 Yea, it shall come in a day when there shall be heard of fires, and tempests, and vapors of smoke in foreign lands;
30 And there shall also be heard of wars, rumors of wars, and earthquakes in divers places.
31 Yea, it shall come in a day when there shall be great pollutions upon the face of the earth; there shall be murders, and robbing, and lying, and deceivings, and whoredoms, and all manner of abominations…
34 Behold, the Lord hath shown unto me great and marvelous things concerning that which must shortly come, at that day when these things shall come forth among you.
35 Behold, I speak unto you as if ye were present, and yet ye are not. But behold, Jesus Christ hath shown you unto me, and I know your doing” (Mormon 8:23-31;34, 35).