Deuteronomy 21:3-5

Revised Standard Version

³ and the elders of the city which is nearest to the slain man shall take a heifer which has never been worked and which has not pulled in the yoke. ⁴ And the elders of that city shall bring the heifer down to a valley with running water, which is neither plowed nor sown, and shall break the heifer’s neck there in the valley. ⁵ And the priests the sons of Levi shall come forward, for the Lord your God has chosen them to minister to him and to bless in the name of the Lord, and by their word every dispute and every assault shall be settled.