'Who Testifies' in the Bible

There is another who testifies about me, and I know that the testimony which he testifies about me is true.

I am the one who testifies concerning myself, and the Father who sent me testifies concerning me."

This is the one who came by water and blood--Jesus Christ, not with the water only, but with the water and with the blood. And the Spirit is the one who testifies, because the Spirit is the truth.

The one who testifies about these [things] says, "Yes, I am coming quickly!" Amen! Come, Lord Jesus!