'Witness' in the Bible

and from Jesus Christ -- the faithful witness, the firstborn from among the dead, the ruler over the kings of the earth. To the one who loves us and has set us free from our sins at the cost of his own blood

I know where you live -- where Satan's throne is. Yet you continue to cling to my name and you have not denied your faith in me, even in the days of Antipas, my faithful witness, who was killed in your city where Satan lives.

"To the angel of the church in Laodicea write the following: "This is the solemn pronouncement of the Amen, the faithful and true witness, the originator of God's creation: