Revelation 1:2

2whoὃςtestifiedἐμαρτύρησενto theτὸνwordλόγοντοῦof Godθεοῦandκαὶto theτὴνtestimonyμαρτυρίανof JesusἸησοῦChristΧριστοῦ,as much asὅσαhe sawεἶδεν.

who testified to the word of God and to the testimony of Jesus Christ, as much as he saw.