18 and the judges shall make a thorough inquiry. If the witness is a false witness, having testified falsely against another, 19 then you shall do to the false witness just as the false witness had meant to do to the other. So you shall purge the evil from your midst. 20 The rest shall hear and be afraid, and a crime such as this shall never again be committed among you.
Matthew Henry's Commentary on Deuteronomy 19:18-20
Commentary on Deuteronomy 19:15-21
(Read Deuteronomy 19:15-21)
Sentence should never be passed upon the testimony of one witness alone. A false witness should suffer the same punishment which he sought to have inflicted upon the person he accused. Nor could any law be more just. Let all Christians not only be cautious in bearing witness in public, but be careful not to join in private slanders; and let all whose consciences accuse them of crime, without delay flee for refuge to the hope set before them in Jesus Christ.