Deuteronomy 21:2-4

International Standard Version

² then let your elders and judges go out and measure the distance from the dead body to the neighboring cities. ³ Then the elders of the city nearest the body are to take a heifer that hasn’t been put to work or hasn’t pulled a yoke ⁴ and^[a] are to lead the heifer to a flowing stream in a valley that has never been tilled or planted. They are to break the heifer’s neck there.