Deuteronomy 21:1-8, 23

Suppose someone is found murdered, lying in a field in the land the LORD your God is giving you as your own, and no one knows who killed the person. Your elders and judges should go to where the body was found, and they should measure how far it is to the nearby cities. The elders of the city nearest the body must take a young cow that has never worked or worn a yoke, and they must lead her down to a valley that has never been plowed or planted, with a stream flowing through it. There they must break the young cow’s neck. The priests, the sons of Levi, should come forward, because they have been chosen by the LORD your God to serve him and to give blessings in the LORD’s name. They are the ones who decide cases of quarreling and attacks. Then all the elders of the city nearest the murdered person should wash their hands over the young cow whose neck was broken in the valley. They should declare: “We did not kill this person, and we did not see it happen. LORD, remove this sin from your people Israel, whom you have saved. Don’t blame your people, the Israelites, for the murder of this innocent person.” And so the murder will be paid for.

But don’t leave his body hanging on the tree overnight; be sure to bury him that same day, because anyone whose body is displayed on a tree is cursed by God. You must not ruin the land the LORD your God is giving you as your own.