John 8:17

καὶ ἐν τ. ν. δέ. But in the law also, your law (about which you profess to be so jealous), it is written. Comp. ‘Thou art called a Jew and restest on the Law’ (Romans 2:17). The Sinaiticus here gives S. John’s usual γεγραμμένον ἐστίν (see on John 2:17), instead of γέγραπται, which he uses nowhere else of O.T. quotations; comp. John 20:31.

δύο�. Not so much a quotation as a reference to Deuteronomy 19:15; Deuteronomy 17:6. Note that the Law speaks of ‘two or three witnesses:’ here we have ‘two men.’ The change is not accidental, but introduces an argument à fortiori: if the testimony of two men is valid, how much more the testimony of two Divine Witnesses. Comp. ‘If we receive the witness of men, the witness of God is greater; for this is the witness of God which He hath testified of His Son’ (1 John 5:9).