'Witness' in the Bible

For I was very glad when brethren came and testified to your truth, that is, how you are walking in truth.

Which have borne witness of thy charity before the church: whom if thou bring forward on their journey after a godly sort, thou shalt do well:

Demetrius has witness borne to him by all, and by the truth itself; and we also bear witness, and thou knowest that our witness is true.