That law for removing the sins of the Israelites so they will belong to the Lord will continue forever. You will do these things once a year.” So they did the things the Lord had commanded Moses.
Aaron and his sons must keep the lamps burning before the Lord from evening till morning. This will be in the Meeting Tent, outside the curtain which is in front of the Ark. The Israelites and their descendants must obey this rule from now on.
Once a year Aaron must make the altar ready for service to God by putting blood on its corners—the blood of the animal offered to remove sins. He is to do this once a year from now on. This altar belongs completely to the Lord’s service.”
The Lord said to him, “Tell your brother Aaron that there are times when he cannot go behind the curtain into the Most Holy Place where the Ark is. If he goes in when I appear in a cloud over the lid on the Ark, he will die.
Do not do any work on that day, because it is the Day of Cleansing. On that day the priests will go before the Lord and perform the acts to make you clean from sin so you will belong to the Lord.
Then Moses spoke to the people of Israel, and they took the person who had cursed outside the camp and killed him by throwing stones at him. So the people of Israel did as the Lord had commanded Moses.
But only the high priest could go into the second room, and he did that only once a year. He could never enter the inner room without taking blood with him, which he offered to God for himself and for sins the people did without knowing they did them.