bare record of - “testified the word of God” in this book. Where we would say “testifies,” the ancients in epistolary communications use the past tense. The word of God constitutes his testimony; Rev 1:3, “the words of this prophecy.”
the testimony of Jesus - “the Spirit of prophecy” (Rev 19:10).
and of all things that, etc. - The oldest manuscripts omit “and.” Translate, “whatsoever things he saw,” in apposition with “the word of God and the testimony of Jesus Christ.”