Leviticus 17:11 NIV
For the life of a creature is in the blood, and I have given it to you to make atonement for yourselves on the altar; it is the blood that makes atonement for one’s life.
Leviticus 6:7 NIV
In this way the priest will make atonement for them before the Lord, and they will be forgiven for any of the things they did that made them guilty.”