Deuteronomy 19:14-21
More rules
14 When you go to live in the land that the Lord your God is giving to you, each family will receive their piece of land. You must never move the stones that show the edge of your neighbour's land. It has always belonged to them.
15 If only one person says that he has seen someone do something wrong, that is not enough. There must be at least two or three people who saw the sin. Then the judge may say that the person is guilty.
16 Somebody may accuse another person because he wants to hurt him. He tells lies against him. 17 Then both of them must stand in front of the judges that the Lord has chosen. Those are the priests and the judges who have authority at that time. 18 The judges must be careful to discover who is telling the truth. The person may be speaking lies against another Israelite to accuse him. 19 If he is telling lies, you must punish him in the same way that he wanted to punish the other Israelite. You must remove evil things like this from among yourselves. 20 Then everyone else will hear what has happened. They will be afraid to do any more evil things like that. 21 Do not be sorry for people who are guilty. Punish people as they deserve: a life for a life, an eye for an eye, a tooth for a tooth, a hand for a hand, a foot for a foot.