Whatsoever they shall speak when moved upon by the Holy Ghost

Doctrine and Covenants 68:4

And whatsoever they shall speak when moved upon by the Holy Ghost shall be scripture, shall be the will of the Lord, shall be the mind of the Lord, shall be the word of the Lord, shall be the voice of the Lord, and the power of God unto salvation. https://www.lds.org/scriptures/dc-testament/dc/68?lang=eng

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Source: http://spiritualcrusade.blogspot.com/2017/05/prophets-speak-word-of-god-when-moved.html