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Administration of Justice
5then you are to bring out to your gates that man or woman who has done this evil deed, that is, the man or the woman, and you shall stone them to death. 6On the testimony of two witnesses or three witnesses, the condemned shall be put to death; he shall not be put to death on the testimony of only one witness. 7The hands of the witnesses shall be first against him to put him to death, and afterward the hands of all the people. So you shall eliminate the evil from your midst.
Deuteronomy 17:5-7 (NASB)