Revelation 1:2

2 who testifies to everything he saw—that is, the word of God and the testimony of Jesus Christ.

Read Revelation 1:2 Using Other Translations

Who bare record of the word of God, and of the testimony of Jesus Christ, and of all things that he saw.
who bore witness to the word of God and to the testimony of Jesus Christ, even to all that he saw.
who faithfully reported everything he saw. This is his report of the word of God and the testimony of Jesus Christ.