Deuteronomy 21:6-9

6All the leaders from the city which was nearest the murder victim must wash their hands over the dead heifer.

7Then they must make this formal statement: “We didn’t commit this murder, and we didn’t witness it.

8Lord, make peace with your people Israel, whom you freed. Don’t let the guilt of this unsolved murder remain among your people Israel.” Then there will be peace with the Lord despite the murder.

9This is how you will get rid of the guilt of an unsolved murder by doing what the Lord considers right.