Deuteronomy 17:2-7

2“If a man or woman among you in one of your towns that the Lord your God will give you is discovered doing evil in the sight of the Lord your God and violating his covenant

3and has gone to serve other gods by bowing in worship to the sun, moon, or all the stars in the sky  — which I have forbidden  —

4and if you are told or hear about it, then investigate it thoroughly. If the report turns out to be true that this detestable act has been done in Israel,

5you are to bring out to your city gates that man or woman who has done this evil thing and stone them to death.

6The one condemned to die is to be executed on the testimony of two or three witnesses. No one is to be executed on the testimony of a single witness.

7The witnesses’ hands are to be the first in putting him to death, and after that, the hands of all the people. You must purge the evil from you.