Sacrifices for Sin (Atonement)

In the Old Testament Leviticus 9:7 Moses said to Aaron, "Come to the altar and sacrifice your sin offering and your burnt offering and make atonement for yourself and the people; sacrifice the offering that is for the people and make atonement for them, as the LORD has commanded." Hebrews 5 explains that "Every high priest is selected from among men and is appointed to represent them in matters related to God, to offer gifts and sacrifices for sins." that in Hebrews 7 explains that Jesus is the "high priest meets our need—one who is holy, blameless, pure, set apart from sinners, exalted above the heavens. Unlike the other high priests, he does not need to offer sacrifices day after day, first for his own sins, and then for the sins of the people. He sacrificed for their sins once for all when he offered himself. For the law appoints as high priests men who are weak; but the oath, which came after the law, appointed the Son, who has been made perfect forever." Pretty clear to me. Romans 3:25 God presented him as a sacrifice of atonement, through faith in his blood. He did this to demonstrate his justice, because in his forbearance he had left the sins committed beforehand unpunished— 1 John 2:2 He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world. 1 John 4:10 This is love: not that we loved God, but that he loved us and sent his Son as an atoning sacrifice for our sins. 1 Peter 4:1 (NIV) Therefore, since Christ suffered in his body, arm yourselves also with the same attitude, because he who has suffered in his body is done with sin.