Deuteronomy 21:2-4

World English Bible

² then your elders and your judges shall come out, and they shall measure to the cities which are around him who is slain. ³ It shall be that the elders of the city which is nearest to the slain man shall take a heifer of the herd, which hasn’t been worked with and which has not drawn in the yoke. ⁴ 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.