15 "One witness shall not rise against a man concerning any iniquity or any sin that he commits; by the mouth of two or three witnesses the matter shall be established. 16 If a false witness rises against any man to testify against him of wrongdoing, 17 then both men in the controversy shall stand before the Lord, before the priests and the judges who serve in those days. 18 And the judges shall make careful inquiry, and indeed, if the witness is a false witness, who has testified falsely against his brother, 19 then you shall do to him as he thought to have done to his brother; so you shall put away the evil from among you.
Matthew Henry's Commentary on Deuteronomy 19:15-19
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.