Leviticus 17:10-12 New Revised Standard Version (NRSV)
Eating Blood Prohibited
10 If anyone of the house of Israel or of the aliens who reside among them eats any blood, I will set my face against that person who eats blood, and will cut that person off from the people. 11 For the life of the flesh is in the blood; and I have given it to you for making atonement for your lives on the altar; for, as life, it is the blood that makes atonement. 12 Therefore I have said to the people of Israel: No person among you shall eat blood, nor shall any alien who resides among you eat blood.