Deuteronomy 21:6-8

All the elders of that city nearest to the dead man shall wash their hands over the heifer whose neck was broken in the valley; and they shall respond, and say, ‘Our hands did not shed this blood, nor did our eyes see it. Forgive Your people Israel whom You have redeemed, O LORD, and do not put the guilt of innocent blood among Your people Israel.’ And the guilt of blood shall be forgiven them.