Abr. 4:26-27; Moses 6:8
“It is held by some that Adam was not the first man upon this earth, and that the original human being was a development from lower orders of the animal creation. These, however, are the theories of men. The word of the Lord declares that Adam was ‘the first man of all men’ (Moses 1:34), and we are therefore in duty bound to regard him as the primal parent of our race. It was shown to the brother of Jared that all men were created in the beginning after the image of God; and whether we take this to mean the spirit or the body, or both, it commits us to the same conclusion: Man began life as a human being, in the likeness of our heavenly Father.” (Joseph F. Smith, John R. Winder, & Anthon H. Lund, Improvement Era, Nov. 1909; 13:75-81)