Doctrine and Covenants — Revelation through Joseph Smith…
“ Behold, I have seen the things which the Lord hath shown unto Joseph Smith, Jun., and I know of a surety that they are true, for I have seen them, for they have been shown unto me by the power of God and not of man. 26 And I the Lord command him, my servant Martin Harris, that he shall say no more unto them concerning these things, except he shall say: I have seen them, and they have been shown unto me by the power of God; and these are the words which he shall say. ”
