Commentaries:
Barnes' Notes
In your law - Deuteronomy 17:6; Deuteronomy 19:15. Compare Matthew 18:16. This related to cases in which the life of an individual was involved. Jesus says that if, in such a case, the testimony of two men were sufficient to establish a fact, his own testimony and that of his Father ought to be esteemed ample evidence in the case of religious doctrine.
Two men - If two men could confirm a case, the evidence of Jesus and of God ought not to be deemed insufficient.
Is true - In Deuteronomy, "established." This means the same thing. It is confirmed; is worthy of belief.
Other Barnes' Notes entries containing John 8:17:
Matthew 18:16
Matthew 19:1
John 5:31
John 5:31
Romans 2:12
2 Corinthians 13:1
1 Timothy 5:19
Revelation 11:3
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