Deuteronomy 21:6-9

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6} 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; ^{Tools
7} and they shall respond, and say, ‘Our hands did not shed this blood, nor did our eyes see it. ^{Tools
8} 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. ^{Tools
9} So shall you remove the guilt of innocent blood from among you, when you do what is right in the sight of the Lord.