David Dille reports Martin Harris affirming that Joseph translated with the gift and power of the BOM.
D.B. Dille, “Additional Testimony of Martin Harris (One of the Three Witnesses) to the Coming Forth of the Book of Mormon,” Millennial Star 21, no. 34 (August 20, 1859): 545, interview conducted in September 15, 1853
I know that the plates have been translated by the gift and power of God, for his voice declared it unto us; therefore I know of a surety that the work is true. For,” continued Mr. Harris, “did I not at one time hold the plates on my knee an hour-and-a-half, whilst in conversation with Joseph, when we went to bury them in the woods, that the enemy might not obtain them? Yes, I did. And as many of the plates as Joseph Smith translated I handled with my hands, plate after plate.[”]