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).

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