John 8:13

Of thyself (peri seautou). This technical objection was according to the rules of evidence among the rabbis. "No man can give witness for himself" (Mishnah, Ketub. 11. 9). Hence, they say, "not true" (ouk alhqe), not pertinent. "They were still in the region of pedantic rules and external tests." In John 5:31 Jesus acknowledged this technical need of further witness outside of his own claims ( John 5:19-30 ) and proceeded to give it ( John 5:32-47 ) in the testimony of the Baptist, of the Father, of his works, of the Scriptures, and of Moses in particular.