John 21:24
This was the disciple who bears testimony to these facts and who wrote them down; his testimony, we know, is true.
John 19:35
He who saw it has borne witness (his witness is true; God knows he is telling the truth), that you may believe.
3 John 1:12
Everybody testifies to Demetrius, and so does the Truth itself: I testify to him too, and you know my testimony is true.
John 15:27
and you too are witnesses, for you have been with me from the very beginning.
1 John 1:1-2
It is of what existed from the very beginning, of what we heard, of what we saw, of what we witnessed and touched with our own hands, it is of the Logos of Life
1 John 5:6
Jesus Christ, he it is who came by water, blood, and Spirit ??not by the water alone, but by the water and the blood.