Deuteronomy 21:6-8

6All the elders of the city nearest to the victim will wash their hands by the stream over the young cow whose neck has been broken.

7They will declare, ‘Our hands did not shed this blood; our eyes did not see it.

8Lord, wipe away the guilt of your people Israel whom you redeemed, and do not hold the shedding of innocent blood against them.’ Then the responsibility for bloodshed will be wiped away from them.