Romans 3:24 - (NIV) God presented him as a sacrifice of atonement, through faith in his blood.
The word for "sacrifice" is the Greek word hilasterion {hil-as-tay'-ree-on} and is the same word the Greek writers used to explain the blood work done in the Holy of Holies in the Tabernacle in order to pay for the sins of Israel. The blood had to be sprinkled - the animal had to be killed in order tfor the sins of the people to be paid! Hilasterion means satisfaction - in other words, when Jesus went to the cross, the payment satisfied God's need for justice.
Jesus the hilasterion - the satisfaction needed to pay the debt.