Hebrews 9:6-7

6So that was how they prepared the special tent. Then the priests would go into the first room of the tent every day. They went in there to serve God, as his rules taught.

7But only the special leader of the priests could go into the second room. He went in there only once every year. He had to take with him blood from an animal that they had killed. He offered the blood to God on his own behalf, so that God would forgive his sins. He also offered it on behalf of the people. Then God would forgive their mistakes too.