Revelation 1:2

who testified the word of God, and the testimony of Jesus Christ, whatever he saw.

Revelation 1:5

and from Jesus Christ, the faithful witness, the first born of the dead, and the ruler of the kings of the earth; to him who has loved us, and washed us from our sins in his own blood,

Revelation 3:14

And by the messenger of the congregation in Laodicea, write: These things says the AMEN, the Faithful and true Witness, the Beginning of the creation of God:

Treasury of Scripture Knowledge

Summary

Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.

Bible References

And my servant

Revelation 1:2
who testified the word of God, and the testimony of Jesus Christ, whatever he saw.
Revelation 3:14
And by the messenger of the congregation in Laodicea, write: These things says the AMEN, the Faithful and true Witness, the Beginning of the creation of God: