2 Nephi 1:104 Wherefore, he said, unto Eve, yea, even that old serpent, who is the devil, who is the father of all lies; wherefore he said, Partake of the forbidden fruit, and ye shall not die, but ye shall be as God, knowing good and evil.
Alma 9:38 Now we see that Adam did fall by the partaking of the forbidden fruit, according to the word of God; and thus we see, that by his fall, all mankind became a lost and a fallen people.