Hebrews 1:3

He, reflecting God's bright glory and stamped with God's own character, sustains the universe with his word of power; when he had secured our purification from sins, he sat down at the right hand of the Majesty on high;

Hebrews 9:7

but the second tent is entered only once a year by the high priest alone ??and it must not be without blood, which he presents on behalf of himself and the errors of the People.

Hebrews 9:22-23

In fact, one might almost say that by Law everything is cleansed with blood. No blood shed, no remission of sins!

Hebrews 9:25

Nor was it to offer himself repeatedly, like the high priest entering the holy place every year with blood that was not his own: ??26 for in that case he would have had to suffer repeatedly, ever since the world was founded. Nay, once for all, at the end of the world, he has appeared with his self-sacrifice to abolish sin.

Treasury of Scripture Knowledge

Summary

And Aaron shall make an atonement upon the horns of it once in a year with the blood of the sin offering of atonements: once in the year shall he make atonement upon it throughout your generations: it is most holy unto the LORD.

Bible References

Aaron

Hebrews 1:3
He, reflecting God's bright glory and stamped with God's own character, sustains the universe with his word of power; when he had secured our purification from sins, he sat down at the right hand of the Majesty on high;
Hebrews 9:7
but the second tent is entered only once a year by the high priest alone ??and it must not be without blood, which he presents on behalf of himself and the errors of the People.