'Witness' in the Bible

For I rejoiced greatly, when brethren came and bare witness unto thy truth, even as thou walkest in truth.

who bare witness to thy love before the church: whom thou wilt do well to set forward on their journey worthily of God:

Demetrius hath the witness of all men , and of the truth itself: yea, we also bear witness: and thou knowest that our witness is true.