John 21:24
This is the disciple who testifies concerning these things, and wrote these things; and we know that his testimony is true.
John 19:35
And he who has seen has testified, and his testimony is true; and he knows that he says what is true, that ye also may believe.
3 John 1:12
To Demetrius testimony has been borne by all, and by the truth itself; and we also bear testimony, and you know that our testimony is true.
John 15:27
and ye also testify, because ye are with Me from the beginning."
1 John 1:1-2
That which was from the beginning, that which we have heard, that which we have seen with our eyes, that which we gazed upon, and our hands handled, concerning the Word of Life
1 John 5:6
This is He Who came through water and blood, Jesus Christ; not in the water only, but in the water and in the blood.