Deuteronomy 21:4-6 ▼

4 bring the heifer to a valley with running water that has not been plowed or sown, and break its neck there by the stream.

5 And the priests, the sons of Levi, shall come forward, for the LORD your God has chosen them to serve Him and pronounce blessings in His name and to give a ruling in every dispute and case of assault.

6 Then all the elders of the city nearest the victim shall wash their hands by the stream over the heifer whose neck has been broken,