'Testify' in the Bible

And needed not that any should testify of man: for he knew what was in man.

Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness.

Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me.

The world cannot hate you; but me it hateth, because I testify of it, that the works thereof are evil.

But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me: