'Innocent Blood' in the Bible

If ye oppress not the stranger, the fatherless, and the widow, and shed not innocent blood in this place, neither walk after other gods to your hurt:

Thus saith the LORD; Execute ye judgment and righteousness, and deliver him that is laid waste out of the hand of the oppressor: and do no wrong, do no violence to the stranger, the fatherless, nor the widow, neither shed innocent blood in this place.

But thy eyes and thy heart are only for thy covetousness, and for shedding innocent blood, and for oppression, and for violence, to do it.

But know ye for certain, that if ye put me to death, ye will surely bring innocent blood upon yourselves, upon this city, and upon its inhabitants: for of a truth the LORD hath sent me to you to speak all these words in your ears.