Testify See also Testimony To bear witness by the power of the Holy Ghost; to make a solemn declaration of truth based on personal knowledge or belief. The Comforter shall testify of me, John 15:26. He commanded us to preach and to testify, Acts 10:42. Three witnesses shall testify to the truth, 2 Ne. 27:12. The power of the Holy Ghost carrieth it unto the hearts of the children of men, 2 Ne. 33:1. The scriptures testify of Christ, Jacob 7:10–11 (John 5:39). I testify unto you that I do know that these things whereof I have spoken are true, Alma 5:45 (Alma 34:8). Ye shall testify of them by the power of God, D&C 17:3–5. That which the Spirit testifies unto you, ye should do, D&C 46:7. I sent you out to testify and warn, D&C 88:81.