Deuteronomy 17:2-7

2“If there is discovered among you, within any of your cities, which the Lord your God is giving you, a man or a woman who does evil in the sight of the Lord your God, by transgressing (violating) His covenant,

3and has gone and served other gods and worshiped them, or the sun or the moon or any of the heavenly host, [doing these things] which I have commanded not to do,

4and if it is told to you and you hear about it, then you shall investigate thoroughly [all the charges]. If it is confirmed beyond doubt that this detestable thing has been done in Israel,

5then you shall bring that man or that woman who has done this evil thing to the gates [of your city] and you shall stone the man or the woman to death.

6On the evidence of two or three witnesses, he who is to die shall be put to death; he shall not be put to death on the evidence of [only] one witness.

7The hand of the witnesses shall be the first against him to put him to death, and afterward the hand of all the people. So you shall remove the evil from among you.