Leviticus 17:10-12

10An Israelite or a foreigner who lives among you must not eat blood. And they must not drink it. If somebody does, God will turn away from him. He will take that person away from his people.

11The blood of an animal gives it life. You must put the blood on the altar. God has given the blood to you to atone for your sins. It makes your life right again, because of the blood.

12For this reason, Israel's people must not eat blood. And the people who are travelling with them must not eat blood.