'Testimony is True' in the Bible

There is Another who gives testimony concerning me, and I know that the testimony is true which He offers concerning me.

"Even if I am giving testimony about myself," replied Jesus, "my testimony is true; for I know where I came from and where I am going, but you know neither of these two things.

That is the disciple who gives his testimony as to these matters, and has written this history; and we know that his testimony is true.

This testimony is true. Therefore sternly denounce them, that they may be robust in their faith,