Leviticus 16:1-3

Amplified Bible

Law of Atonement

16 Then the Lord spoke to Moses after the death of the two sons of Aaron who had died when they [irreverently] approached the presence of the Lord.^(A) ²The Lord said to Moses,

“Tell Aaron your brother that he ^[a]must not enter at any time into the Holy Place inside the veil (the Holy of Holies), before the ^[b]mercy seat which is on the ark, or he will die, for I will appear in the cloud over the mercy seat.^(B) ³Aaron [as high priest] shall enter the Holy Place in this way: with [the blood of] a young bull as a sin offering and [the blood of] a ram as a burnt offering.

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Footnotes

Leviticus 16:2 The high priest was permitted to enter the Most Holy Place only once a year. The Day of Atonement was the most sacred of all the festivals and the prescribed purpose of this inclusive sacrifice was to atone for the sins of both the nation and the individual believer, and in this way reconcile God’s chosen people to Himself. Only by carefully following all of God’s instructions, could the high priest enter God’s presence and live.
Leviticus 16:2 Lit propitiatory.