Deuteronomy 21:4-6

King James Version

⁴ And the elders of that city shall bring down the heifer unto a rough valley, which is neither eared nor sown, and shall strike off the heifer's neck there in the valley:

⁵ And the priests the sons of Levi shall come near; for them the Lord thy God hath chosen to minister unto him, and to bless in the name of the Lord; and by their word shall every controversy and every stroke be tried:

⁶ And all the elders of that city, that are next unto the slain man, shall wash their hands over the heifer that is beheaded in the valley: