John 21:24
This is the disciple who testifieth of these things, and wrote these things: and we know that his testimony is true.
John 19:35
And he that saw it, testified, and his testimony is true: and he knoweth that he speaketh truth, that ye may believe.
3 John 1:12
Demetrius hath good report by all men, and by the truth itself: and we also bear testimony; and ye know that our testimony is true.
John 15:27
And ye also shall bear testimony, because ye have been with me from the beginning.
1 John 1:1-2
That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the word of life;
1 John 5:6
This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth testimony, because the Spirit is truth.