'Witness' in the Bible

who testified to the word of God and to the testimony of Jesus Christ, even to all that he saw.

and from Jesus Christ, the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. To Him who loves us and released us from our sins by His blood—

‘I know where you dwell, where Satan’s throne is; and you hold fast My name, and did not deny My faith even in the days of Antipas, My witness, My faithful one, who was killed among you, where Satan dwells.

“To the angel of the church in Laodicea write:The Amen, the faithful and true Witness, the Beginning of the creation of God, says this: