Deuteronomy 21:3-5

New Century Version

³ The elders of the city nearest the body must take a young cow that has never worked or worn a yoke, ⁴ 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. ⁵ 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.