'Blood' in the Bible

Only the firstborn of an ox or the firstborn of a sheep or the firstborn of a goat you will not redeem; they [are] holy. Their blood you will sprinkle over the altar, and their fat you will turn into smoke [as] an offering made by fire, a fragrance of appeasement for Yahweh.

Then Eleazar the priest will take [some of] its blood on his finger and spatter it toward the mouth of the tent of assembly seven times.

The heifer will be burned in his sight; its skin, its meat, and its blood, in addition to its offal, will burn.

Look! [the] people will rise like the lion; he raises himself and will not lie down until he eats [the] prey and drinks the blood of the slain."

The blood avenger himself will put the killer to death; he must put him to death when meeting him.

then the community will judge between the striker and between the blood avenger according to these ordinances.

The community will deliver the killer from the hand of the blood avenger, and the community will restore him to the city of his refuge to which he fled; and he will live there in it until the death of the high priest who was anointed with holy oil.

and the blood avenger finds him outside the territory of the city of his refuge, and the blood avenger kills the killer, {he will not be guilty of blood}

So you will not pollute the land in which you are; because blood pollutes the land, and no atonement can be made for the land for the blood that is poured out on it except with the blood of the one who poured it out.