Leviticus 16:34

“And this shall be an everlasting statute to you, to make atonement for the children of Israel because of all their sins once in the year.” And he did as Yahweh commanded Moses.

And it is repeated that this statute should be applied into the distant future so as to make atonement for the children of Israel because of their sins once a year. In the final analysis it was ‘the children of Israel' whom God wanted to bless and save. And the writer finishes the record with a confirmation of Aaron's obedience to what God had said. presumably this is speaking of his first observance of the Day of Atonement, and the point is that he carried it out to the letter.

As we cease our study into the Day of Atonement we, as Christians, have much to glory in. This Day was one that had to be repeated every year, it was carried through by a sinful High Priest who had first to offer purification for sin offerings for himself, on the basis of what was involved its effect could only be partial (no he-goat could bear all the sins of Israel, nor were they totally annihilated), it only allowed the High Priest into Yahweh's presence once a year, and the remainder not at all.

But we as Christians know that Christ has made for us a total and complete sacrifice offered once-for-all (Hebrews 10:12), has no need to offer a purification for sin offering for Himself (Hebrews 7:26), made a sacrifice that was truly sufficient for all sin for all time (Hebrews 9:14; Hebrews 10:10; Hebrews 10:12; Hebrews 10:14), has borne all our sin for us and has removed it for ever, and has made a way for each individual Christ to enter into the Holiest of all, into the very presence of God, by His blood and through His death and resurrection (Hebrews 10:19) so that they may be presented perfect before Him without spot, or wrinkle, or any such thing, but holy and without blemish (Ephesians 5:27).