When the Pharisees object that Jesus bears witness about himself, Jesus answers on their legal ground: 'It is also written in your law, that the testimony of two men is true.'
He then names the two witnesses—himself and the Father who sent him.
Jesus in Context
The Law of Two Witnesses and the Father-Son Testimony
Jesus answers the challenge to his self-testimony by invoking the Torah's two-witness principle and identifying himself and the Father who sent him as the two witnesses.
Introduction
Historical and Cultural Context
Deuteronomy 17 and 19 establish the importance of multiple witnesses in serious judicial matters. John repeatedly uses legal vocabulary of witness, testimony, judgment, and truth, creating a sustained courtroom motif around Jesus' identity. Jesus' phrase 'your law' does not necessarily distance him from Torah; it appeals to the law acknowledged by his interlocutors.
The striking move is that the second witness is not another human authority but the Father.
Why It Matters
The legal background shows that Jesus is not retreating from the demand for testimony. He claims that the required corroboration exists at the highest possible level.
John thereby turns a procedural objection into a Christological claim: knowing Jesus and evaluating his testimony cannot finally be separated from knowing the Father who sent him.