John 21:24
This is the disciple who is testifing of these things, and hath written these things: and we know that his testimony is true.
John 19:35
And he that saw it bore witness, and we know that his testimony is true: and he himself is conscious that he speaketh what is true, that ye might believe.
3 John 1:12
Demetrius hath a good testimony from all men, and from the truth itself: and we also bear our testimony, and ye know that our testimony is true.
John 15:27
and ye too shall bear your testimony, because ye have been with me from the beginning.
1 John 1:1-2
THAT which was from the beginning, which we have seen with our eyes, which we have gazed upon, and our hands have handled of the word of life;
1 John 5:6
This is he who came by water and blood, Jesus the Messiah; not by the water only, but by the water and the blood: and the Spirit is the witnessing person, because the Spirit is the truth.