John 21:24
This is the disciple testifying of these, and having written this: and we know that his testimony is true.
John 19:35
And he having seen has testified, and his testimony is true: and he knows that he says true, that ye might believe.
3 John 1:12
It has been testified to Demetrius by all, and by the truth itself: and we also testify; and know that our testimony is true.
John 15:27
And ye also testify, for ye are with me from the beginning.
1 John 1:1-2
What was from the beginning, which we have heard, which we have seen with our eyes, which we beheld, and our own hands felt, concerning the word of life;
1 John 5:6
This is he having come by water and blood, Jesus the Christ; not by water alone, but by water and blood. And the Spirit is testifying, for the Spirit is truth.