'Bear Witness' in the Bible

All the prophets testify about Him, that through His name everyone who believes in Him [whoever trusts in and relies on Him, accepting Him as Savior and Messiah] receives forgiveness of sins.”

On the following night the Lord stood near Paul and said, “Be brave; for as you have solemnly and faithfully witnessed about Me at Jerusalem, so you must also testify at Rome.”

Get up and stand on your feet. I have appeared to you for this purpose, to appoint you [to serve] as a minister and as a witness [to testify, with authority,] not only to the things which you have seen, but also to the things in which I will appear to you,