In the Book of Genesis [ Genesis 2:7] we are told that Adam obtained his body from the dust of the earth, and that he was not subject to death is inferred in the commandment the Lord gave him, that if he transgressed the divine commandment and ate the fruit of the tree of the knowledge of good and evil, he should surely die [ Genesis 2:17]. In the Book of Mormon [ 2 Nephi 2:22] we are positively informed that Adam would have lived forever in the garden if he had not partaken of the forbidden fruit. So Adam was in no sense mortal until after his transgression. That his immortal spirit came from another world is verily true, just as it is true of each one of us, for we all lived in the spirit existence before we came into this world and obtained bodies which inherited mortality through the fall of Adam.(Joseph Fielding Smith, Answers to Gospel Questions, 1:6)
