Through Joseph's instrumentality, God restored to us a knowledge of the many covenants he has made with the fathers-those saved beings who sought for and obtained promises on our behalf.
With Noah, God covenanted that Zion would come again as soon as men kept his commandments:
And the bow shall be in the cloud; and I will look upon it, that I may remember the everlasting covenant, which I made unto thy father Enoch; that, when men should keep all my commandments, Zion should again come on the earth, the city of Enoch which I have caught up unto myself. And this is mine everlasting covenant, that when thy posterity shall embrace the truth, and look upward, then shall Zion look downward, and all the heavens shall shake with gladness, and the earth shall tremble with joy; And the general assembly of the church of the firstborn shall come down out of heaven, and possess the earth, and shall have place until the end come. And this is mine everlasting covenant, which I made with thy father Enoch. And the bow shall be in the cloud, and I will establish my covenant unto thee, which I have made between me and thee, for every living creature of all flesh that shall be upon the earth. And God said unto Noah, This is the token of the covenant which I have established between me and thee; for all flesh that shall be upon the earth. (JST Genesis 9:21-25)
To Joseph of Egypt, God promised that he would raise up a righteous branch from his loins and that Moses would deliver that branch both in the former day and (by another figure like Moses) in the latter day:
And Joseph said unto his brethren, I die, and go unto my fathers; and I go down to my grave with joy. The God of my father Jacob be with you, to deliver you out of affiiction in the days of your bondage; for the Lord hath visited me, and I have obtained a promise of the Lord, that out of the fruit of my loins, the Lord God will raise up a righteous branch out of my loins; and unto thee, whom my father Jacob hath named Israel, a prophet; (not the Messiah who is called Shilo;) and this prophet shall deliver my people out of Egypt in the days of thy bondage. (JST Gen 50:24)
Through Joseph Smith, we are told of the promise God made to Melchizedek that would apply equally to all who received a fullness of the priesthood, showing not only the manner in which it is received, but the powers conveyed upon receipt:
And Melchizedek lifted up his voice and blessed Abram. Now Melchizedek was a man of faith, who wrought righteousness; and when a child he feared God, and stopped the mouths of lions, and quenched the violence of fire. And thus, having been approved of God, he was ordained an high priest after the order of the covenant which God made with Enoch, It being after the order of the Son of God; which order came, not by man, nor the will of man; neither by father nor mother; neither by beginning of days nor end of years; but of God; And it was delivered unto men by the calling of his own voice, according to his own will, unto as many as believed on his name. For God having sworn unto Enoch and unto his seed with an oath by himself; that every one being ordained after this order and calling should have power, by faith, to break mountains, to divide the seas, to dry up waters, to turn them out of their course; To put at defiance the armies of nations, to divide the earth, to break every band, to stand in the presence of God; to do all things according to his will, according to his command, subdue principalities and powers; and this by the will of the Son of God which was from before the foundation of the world. And men having this faith, coming up unto this order of God, were translated and taken up into heaven. And now, Melchizedek was a priest of this order; therefore he obtained peace in Salem, and was called the Prince of peace. And his people wrought righteousness, and obtained heaven, and sought for the city of Enoch which God had before taken, separating it from the earth, having reserved it unto the latter days, or the end of the world; And hath said, and sworn with an oath, that the heavens and the earth should come together; and the sons of God should be tried so as by fire. And this Melchizedek, having thus established righteousness, was called the king of heaven by his people, or, in other words, the King of peace. And he lifted up his voice, and he blessed Abram, being the high priest, and the keeper of the storehouse of God; Him whom God had appointed to receive tithes for the poor. Wherefore, Abram paid unto him tithes of all that he had, of all the riches which he possessed, which God had given him more than that which he had need. And it came to pass, that God blessed Abram, and gave unto him riches, and honor, and lands for an everlasting possession; according to the covenant which he had made, and according to the blessing wherewith Melchizedek had blessed him. (JST Gen 14:25-40)
We learn, through Joseph, of the covenant God made with Abraham promising him posterity and priesthood:
For I am the Lord thy God; I dwell in heaven; the earth is my footstool; I stretch my hand over the sea, and it obeys my voice; I cause the wind and the fire to be my chariot; I say to the mountains-Depart hence-and behold, they are taken away by a whirlwind, in an instant, suddenly. My name is Jehovah, and I know the end from the beginning; therefore my hand shall be over thee. And I will make of thee a great nation, and I will bless thee above measure, and make thy name great among all nations, and thou shalt be a blessing unto thy seed after thee, that in their hands they shall bear this ministry and Priesthood unto all nations; And I will bless them through thy name; for as many as receive this Gospel shall be called after thy name, and shall be accounted thy seed, and shall rise up and bless thee, as their father; And I will bless them that bless thee, and curse them that curse thee; and in thee (that is, in thy Priesthood) and in thy seed (that is, thy Priesthood), for I give unto thee a promise that this right shall continue in thee, and in thy seed after thee (that is to say, the literal seed, or the seed of the body) shall all the families of the earth be blessed, even with the blessings of the Gospel, which are the blessings of salvation, even of life eternal. (Abraham 2:8-11)
In the Book of Mormon, translated by Joseph, we find many of God's promises to the seed of Lehi. Truly Joseph was an instrument for restoring God's covenants.