Deuteronomy 17:5-8

5you must punish that person. Take the man or woman who has done that wicked thing to the gate of the town. Then you must throw stones at that person to kill them.

6But two or three people must agree about what the person has done. You must never kill anyone because of the words of only one person.

7The people who saw the wicked act must throw the first stones to kill the person. Then everyone else must also throw stones. In that way, you must remove evil acts from among you.

8It may be difficult for the judges in your towns to decide what is true. This may happen when one person has attacked or killed another person. It may happen when people cannot agree about some land. It may be anything that people in your towns are arguing about. If you do not know who is right, you must take those people to the place that the Lord your God will choose.