John 21:24

24ThisΟὗτόςisἐστινtheὁdiscipleμαθητὴςὁbearing witnessμαρτυρῶνconcerningπερὶthese thingsτούτωνandκαὶthe [one]ὁhaving writtenγράψαςthese thingsταῦτα,andκαὶwe knowοἴδαμενthatὅτιtrueἀληθὴςof himαὐτοῦtheἡtestimonyμαρτυρίαisἐστίν.

This is the disciple testifying concerning these things, and the one having written these things. And we know that his testimony is true.