Alma 22:13

And Aaron did expound unto him the Scriptures, from the creation of Adam, laying the fall of man before him, and their carnal state, and also the plan of redemption, which was prepared from the foundation of the world, through Christ, for all whosoever would believe on his name.

Aaron explained the Scriptures to him. He started from the creation of Adam. He taught about the fall of man. He taught about their sinful state. He also taught about God’s plan of saving them. This plan was prepared from the beginning of the world through Christ. It is for everyone who would believe in his name.

Aaron explained the scriptures from Adam’s creation forward—the Fall and humanity’s broken condition, and the plan of redemption that God prepared before the world began. Through Christ, anyone who believes in his name can be saved.