John 21:24
The same disciple is he, which testifieth of these things, and wrote these things. And we know, that his testimony is true.
John 19:35
And he that saw it bare record, and his record is true. And he knoweth that he saith true that ye might believe also.
3 John 1:12
Demetrius hath good report of all men, and of the truth. Yea and we ourselves also bear record, and ye know that our record is true.
John 15:27
And ye shall bear witness also, because ye have been with me from the beginning.
1 John 1:1-2
That which was from the beginning, declare we unto you; which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the word of life.
1 John 5:6
This Jesus Christ is he that came by water and blood, not by water only: but by water and blood.