John 21:24
This is the disciple who bears witness concerning these things, and who has written these things; and we know that his witness is true.
John 19:35
And he who saw it bears witness, and his witness is true, and he knows that he says true that ye also may believe.
3 John 1:12
Demetrius has witness borne to him by all, and by the truth itself; and we also bear witness, and thou knowest that our witness is true.
John 15:27
and ye too bear witness, because ye are with me from the beginning.
1 John 1:1-2
That which was from the beginning, that which we have heard, which we have seen with our eyes; that which we contemplated, and our hands handled, concerning the word of life;
1 John 5:6
This is he that came by water and blood, Jesus the Christ; not by water only, but by water and blood. And it is the Spirit that bears witness, for the Spirit is the truth.