'Bears Witness' in the Bible

And you have filled me with wrinkles, which is a witness against me: and my leanness rising up in me bears witness to my face.

There is another that bears witness of me; and I know that the witness which he witnesses of me is true.

I am one that bear witness of myself, and the Father that sent me bears witness of me.

The Spirit himself bears witness with our spirit, that we are the children of God:

This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that bears witness, because the Spirit is truth.