The Day of Atonement
The Old Testament
because on this day atonement will be made for you to cleanse you, and you will be clean from all your sins before the LORD.
Leviticus 16:30
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In the New Testament
He did not enter by the blood of goats and calves, but He entered the Most Holy Place once for all by His own blood, thus securing eternal redemption.
Hebrews 9:12
BSB
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Read the full text (48 verses)
Once a year the high priest enters the most holy place with blood to make atonement. A second goat, the scapegoat, carries the sins of the people into the wilderness.
Hebrews reads the whole sacrificial system as a shadow of Christ: not every year again, but 'once for all'. At Jesus' death the veil that closed off the most holy place is torn from top to bottom.