John 21:24
This is the disciple who testifies to these things, and who wrote these things; and we know that his testimony is true.
John 19:35
He who saw it has testified, and his testimony is true, and he knows that he tells the truth, that you also may believe.
3 John 1:12
Demetrius has received a good testimony from everyone, and from the truth itself; and we add our testimony, and you know that our testimony is true.
John 15:27
And you also will 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 touched, concerning the Word of life,
1 John 5:6
This is he who came by water and bloodJesus Christ; not only by water, but by water and blood.