Hebrews 1:3

He brightly reflects God's glory and is the exact representation of His being, and upholds the universe by His all-powerful word. After securing man's purification from sin He took His seat at the right hand of the Majesty on high,

Hebrews 9:7

But into the second, the High Priest goes only on one day of the year, and goes alone, taking with him blood, which he offers on his own behalf and on account of the sins which the people have ignorantly committed.

Hebrews 9:22-23

Indeed we may almost say that in obedience to the Law everything is sprinkled with blood, and that apart from the outpouring of blood there is no remission of sins.

Hebrews 9:25

Nor did He enter for the purpose of many times offering Himself in sacrifice, just as the High Priest enters the Holy place, year after year, taking with him blood not his own.

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 brightly reflects God's glory and is the exact representation of His being, and upholds the universe by His all-powerful word. After securing man's purification from sin He took His seat at the right hand of the Majesty on high,
Hebrews 9:7
But into the second, the High Priest goes only on one day of the year, and goes alone, taking with him blood, which he offers on his own behalf and on account of the sins which the people have ignorantly committed.