In John 8:13, the Pharisees quote this same principle against Jesus, using his own words to challenge his testimony.

In John 8:14, Jesus counters by saying his self-witness is valid because he knows his heavenly origin, contrasting with the rule here.

In John 8:54, Jesus similarly says self-honor is nothing, reinforcing that only the Father's validation makes his testimony true.

John 8:18 answers the dilemma: Jesus and the Father together bear witness, so his testimony is valid.

1 John 5:9 says God's testimony about his Son is greater, reinforcing that Jesus' self-witness is backed by the Father.