The Lord established the process of repentance and restoration for the children of Israel and underscored its importance. This special day occurred once a year to atone for sin for the next year. This day the high priest performed elaborate rituals to atone for his own sin and then the sins of the people. (Note: Aaron could only enter the Most Holy Place on this day [Leviticus 16:2]).
As the high priest, Aaron was required to sacrifice a bull for his own sins. Further, the annual sacrifice required two goats—one representing the uncleanness and rebellion of the people and the other to serve as a scapegoat. The huge sacrifice emphasized cleansing starting with the leader Aaron and continuing to include the rest of Israel. This sacrifice was done in Israel every year and it was very serious.
Jesus, a sinless man, was offered on the cross of Calvary. He did not need to clean himself up first in order to be worthy of making others clean. He was offered once and for all for any who believe in Him. On the cross He declared, “It is finished,” meaning the offering was sufficient and complete—no repetition is needed [John. 19:30; Hebrews 10:1-12]!
The blood of Christ is the propitiation and expiation for our sins. At the cross, Christ appeased God’s wrath against sin, taking the wrath upon himself [Romans 5:9]. By His blood our sins are gone forever, to be remembered no more [Psalm 103:12; Hebrews 8:12, 10:17]. Jesus is our perfect sacrifice, who did not sin, yet died for the sins of the world; His sacrifice is sufficient and complete, so no more animal offering is required. Now, we must believe in Jesus Christ to be saved from our sins.