Deuteronomy 21:6-8

6All the elders of that city nearest to the dead man shall wash their hands over the heifer whose neck was broken in the valley;

7and they shall respond, and say, ‘Our hands did not shed this blood, nor did our eyes see it.

8Forgive 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.