Deuteronomy 19:15-21

15 A single witness shall not suffice to convict a person of any crime or wrongdoing in connection with any offense that may be committed. Only on the evidence of two or three witnesses shall a charge be sustained.
16 If a malicious witness comes forward to accuse someone of wrongdoing,
17 then both parties to the dispute shall appear before the Lord, before the priests and the judges who are in office in those days,
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.
21 Show no pity: life for life, eye for eye, tooth for tooth, hand for hand, foot for foot.
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