'Testimony is True' in the Bible

Jesus replied, “Even if I do testify on My own behalf, My testimony is valid, because I know where I came from and where I am going; but you do not know where I come from or where I am going.

And he (John, the eyewitness) who has seen it has testified, and his testimony is true; and he knows that he is telling the truth, so that you also [who read this] may believe.

This is the same disciple who is testifying to these things and has recorded them; and we know [without any doubt] that his testimony is true.

Demetrius has received a good testimony and commendation from everyone—and from the truth [the standard of God’s word] itself; and we add our testimony and speak well of him, and you know that our testimony is true.