Deuteronomy 21:6 KJV

4And 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:

5And 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:

6And 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:

7And they shall answer and say, Our hands have not shed this blood, neither have our eyes seen it.

8Be merciful, O LORD, unto thy people Israel, whom thou hast redeemed, and lay not innocent blood unto thy people of Israel’s charge. And the blood shall be forgiven them.