'Innocent Blood' in the Bible

So innocent blood will not be shed in the midst of your land which the Lord your God gives you as an inheritance, and bloodguiltiness be on you.

Forgive Your people Israel whom You have redeemed, O Lord, and do not place the guilt of innocent blood in the midst of Your people Israel.’ And the bloodguiltiness shall be forgiven them.

So you shall remove the guilt of innocent blood from your midst, when you do what is right in the eyes of the Lord.