John 21:24
This is the disciple who testifies of these things, and wrote these things: and we know that his testimony is true.
John 19:35
And he that saw it bares record, and his record is true: and he knows that he says the truth, that you might believe.
3 John 1:12
Demetrius has good report of all men, and of the truth itself: yea, and we also bear witness; and you know that our witness is true.
John 15:27
And you also shall bear witness, because you 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 bears witness, because the Spirit is truth.