John 19:35
“And he that saw it bare record, and his record is true.”
That is, “I heard it not from others, but was myself present and saw it, and the testimony is true.” As may be supposed. For he relates an insult done; he relates not anything great and admirable, that you should suspect his narrative; but securing the mouths of heretics, and loudly proclaiming beforehand the Mysteries that should be, and beholding the treasure laid up in them, he is very exact concerning what took place. And that prophecy also is fulfilled,
Source: Homilies on the Gospel of John (New Advent)