September 22, 2015 marks the Day of Atonement (Leviticus 23:27-28), also known as Yom Kippur.
Literally "the Day of Atonement," Yom Kippur concludes the Ten Days of Awe. It is the holiest and most somber day of the year. (Leviticus 23:27-32) The term "High Holidays" refers to Rosh Hashanah (the Jewish New Year) and Yom Kippur together.
In ancient times, one day of the year, the High Priest entered the Holy of Holies to put the blood of the sacrificed animal on the altar as a sin offering. Through faith, obedience to God's precise instructions resulted in atonement, or covering, for sin. Today, Yom Kippur is a day of fasting and reflecting upon one's sin.
Yom Kippur can be somewhat of a conundrum to Jewish believers in Y'shua. Do they fast and confess our sins like the rest of the Jewish community or do they rejoice in the knowledge that we're forgiven in Messiah? Many Jewish believers view Yom Kippur as a time for identification with our Jewish people, introspection for themselves and intercession for loved ones, knowing all the while that Jesus is the One that makes us at one with God.
* summarized from Jews for Jesus.org
Video of Yom Kippur in 60 seconds <click here>
Yom Kippur is the most solemn holy day of all the Israelite feasts and festivals, occurring once a year as the high priest performs elaborate rituals to atone for the sins of the people. (Leviticus 16:1-34)
Before entering the tabernacle, Aaron was to bathe and put on special garments (v. 4), then sacrifice a bull for a sin offering for himself and his family (v. 6, 11). The blood of the bull was to be sprinkled on the ark of the covenant. Then Aaron was to bring two goats, one to be sacrificed “because of the uncleanness and rebellion of the Israelites, whatever their sins have been” (v. 16), and its blood was sprinkled on the ark of the covenant. The other goat was used as a scapegoat. Aaron placed his hands on its head, confessed over it the rebellion and wickedness of the Israelites, and sent the goat out with an appointed man who released it into the wilderness (v. 21). The goat carried on itself all the sins of the people, which were forgiven for another year (v. 30).
The symbolic significance of the ritual, particularly to Christians, is seen first in the washing and cleansing of the high priest, the man who released the goat, and the man who took the sacrificed animals outside the camp to burn the carcasses (v. 4, 24, 26, 28). Israelite washing ceremonies were required often throughout the Old Testament and symbolized the need for mankind to be cleansed of sin. But it wasn’t until Jesus came to make the “once for all” sacrifice that the need for cleansing ceremonies ceased (Hebrews 7:27). The blood of bulls and goats could only atone for sins if the ritual was continually done year after year, while Christ’s sacrifice was sufficient for all the sins of all who would ever believe in Him. When His sacrifice was made, He declared, “It is finished” (John 19:30). He then sat down at the right hand of God, and no further sacrifice was ever needed (Hebrews 10:1-12).
The sufficiency and completeness of the sacrifice of Christ is also seen in the two goats. The blood of the first goat was sprinkled on the ark, ritually appeasing the wrath of God for another year. The second goat removed the sins of the people into the wilderness where they were forgotten and no longer clung to the people. Sin is both propitiated and expiated God’s way—only by the sacrifice of Christ on the cross. Propitiation is the act of appeasing the wrath of God, while expiation is the act of atoning for sin and removing it from the sinner. Both together are achieved eternally by Christ. When He sacrificed Himself on the cross, He appeased God’s wrath against sin, taking that wrath upon Himself: “Since we have now been justified by his blood, how much more shall we be saved from God's wrath through him!” (Romans 5:9). The removal of sin by the second goat was a living parable of the promise that God would remove our transgressions from us as far as the east is from the west (Psalm 103:12) and that He would remember them no more (Hebrews 8:12; 10:17).
* summarized from Got Questions.org