But only the high priest could go into the second room, and he went in only once a year. Also, he could never enter that room without taking blood with him. He offered that blood to God for himself and for the sins the people committed without knowing they were sinning.
“Once a year Aaron must make a special sacrifice. He will use the blood of the sin offering to erase the sins of the people. He will do this at the horns of this altar. This day will be called the Day of Atonement, and it will be a very special day for the Lord.”
That law will continue forever. Once every year you will purify the Israelites from all their sins.” So they did everything that the Lord had commanded Moses.