The first revelation to Adam in mortality apparently came many years after leaving Eden.  In the interim, he

knew his wife, and she bare unto him sons and daughters, and they began to multiply and to replenish the earth. And from that time forth, the sons and daughters of Adam began to divide two and two in the land, and to till the land, and to tend flocks, and they also begat sons and daughters (Moses 5:2-3).

It was after that time, while calling on the name of the Lord, that

they heard the voice of the Lord from the way toward the Garden of Eden, speaking unto them, and they saw him not; for they were shut out from his presence.

And he gave unto them commandments, that they should worship the Lord their God, and should offer the firstlings of their flocks, for an offering unto the Lord. And Adam was obedient unto the commandments of the Lord.

What were the initial commandments to Adam and Eve?  1.  worship the Lord their God  2. offer the firstlings of their flocks for an offering unto the Lord. 

And after many days an angel of the Lord appeared unto Adam, saying: Why dost thou offer sacrifices unto the Lord? And Adam said unto him: I know not, save the Lord commanded me.

And then the angel spake, saying: This thing is a similitude of the sacrifice of the Only Begotten of the Father, which is full of grace and truth.

Wherefore, thou shalt do all that thou doest in the name of the Son, and thou shalt repent and call upon God in the name of the Son forevermore. (Moses 5:6-8)

In response to their resolve to obey God, an angel came to give them further instructions. The angel gave them more information about the previous commandments, and taught them, apparently for the first time, that there would be an Only Begotten of the Father who would sacrifice himself.

What commandments did the angel give with this knowledge? 1. thou shalt do all that thou doest in the name of the Son 2. and thou shalt repent and call upon God in the name of the Son forevermore.

Accompanying the angel’s instruction came the Holy Ghost:

And in that day the Holy Ghost fell upon Adam, which beareth record of the Father and the Son, saying: I am the Only Begotten of the Father from the beginning, henceforth and forever, that as thou hast fallen thou mayest be redeemed, and all mankind, even as many as will.

And in that day Adam blessed God and was filled, and began to prophesy concerning all the families of the earth, saying: Blessed be the name of God, for because of my transgression my eyes are opened, and in this life I shall have joy, and again in the flesh I shall see God. (vss.9-10)

The message of the Son, relayed by the Holy Ghost, was that Adam could be redeemed. He was “shut out from [God’s] presence“, but he could return, as could “all mankind, even as many as will“.   This joyful return was to happen “in this life…in the flesh.”

The first lesson to Adam should be the first lesson to all mankind:  “Inasmuch as thou has fallen thou mayest be redeemed.  You can have joy in this life by being brought back into the presence of God and seeing him in the flesh.”  This is the redemption made possible the sacrifice of the Only Begotten of the Father, who is full of grace and truth.

And Eve, his wife, heard all these things and was glad, saying: Were it not for our transgression we never should have had seed, and never should have known good and evil, and the joy of our redemption, and the eternal life which God giveth unto all the obedient.

And Adam and Eve blessed the name of God, and they made all things known unto their sons and their daughters. (vss 11-12)

Adam and Eve “made all things known” to their sons and daughters, presumably repeating the messages given by the Lord to that point.

And Satan came among them, saying: I am also a son of God; and he commanded them, saying: Believe it not; and they believed it not, and they loved Satan more than God. And men began from that time forth to be carnal, sensual, and devilish.

The posterity of Adam accepted the idea of a God, and of a son of God, for Satan could win their love by saying, “I am also a son of God”.  They obeyed his command to “believe it not”, rejecting the possibility of redemption through repentance. The universal rejection of Adam’s teachings by his posterity would continue, with very few exceptions.  Almost all of his children have passionately embraced religions that can’t save them, and continue to do so.

And the Lord God called upon men by the Holy Ghost everywhere and commanded them that they should repent; And as many as believed in the Son, and repented of their sins, should be saved; and as many as believed not and repented not, should be damned; and the words went forth out of the mouth of God in a firm decree; wherefore they must be fulfilled.

And Adam and Eve, his wife, ceased not to call upon God. (vss. 13-16)

And thus the Gospel began to be preached, from the beginning, being declared by holy angels sent forth from the presence of God, and by his own voice, and by the gift of the Holy Ghost.

And thus all things were confirmed unto Adam, by an holy ordinance, and the Gospel preached, and a decree sent forth, that it should be in the world, until the end thereof; and thus it was. Amen. (vs. 58-59)

Adam had something called “all things” confirmed unto him by  “an holy ordinance”.   The nature of this gift, and the nature of the ordinance that conveys it, is known only to those who receive it (DC 76:55, 59-61,114-118; Alma 13:8).

Adam’s ministry lasted until the end of his life.  He taught and blessed his posterity, giving them promises in the name of the God (DC 107:42-50).   There were at least some who obeyed, perhaps only in the line of descendants through Seth.

Three years previous to the death of Adam, he called Seth, Enos, Cainan, Mahalaleel, Jared, Enoch, and Methuselah, who were all high priests, with the residue of his posterity who were righteous, into the valley of Adam-ondi-Ahman, and there bestowed upon them his last blessing.

 And the Lord appeared unto them, and they rose up and blessed Adam, and called him Michael, the prince, the archangel.

And the Lord administered comfort unto Adam, and said unto him: I have set thee to be at the head; a multitude of nations shall come of thee, and thou art a prince over them forever.

And Adam stood up in the midst of the congregation; and, notwithstanding he was bowed down with age, being full of the Holy Ghost, predicted whatsoever should befall his posterity unto the latest generation (DC 107:53-57).

This event is the culmination of Adam’s mortal ministry.  It is rare for anyone to gather a group of people who can be “equal in obtaining heavenly things” (DC 78:5), such that the Lord can appear to them. Communing with the Lord was the ultimate purpose of the gathering.

I saw Adam in the valley of Adam-ondi-Ahman. He called together his children and blessed them with a patriarchal blessing. The Lord appeared in their midst, and he (Adam) blessed them all, and foretold what should befall them to the latest generation. This is why Adam blessed his posterity; he wanted to bring them into the presence of God. They looked for a city which hath foundations, whose builder and maker was God. (Joseph Smith, July 1839, Willard Richards pocked companion)

Adam’s ministry brought relatively few back into the presence of God.  It is interesting that Joseph would say that this group “looked for a city… whose builder and maker was God.”  Rather than settle in the cities founded by unrepentant men (Moses 5:42) they sought for, and obtained, a heavenly social order, or civitas.

Adam’s ministry set the pattern for all high priests to follow.  All who thereafter join the priesthood, or fellowship, of heaven, would seek to connect others to that fellowship as Adam did for his children.