After each feast, Job would send for his children and perform a ceremony, as a way of asking God to forgive them for any wrongs they might have done. He would get up early the next morning and offer a sacrifice for each of them, just in case they had sinned or silently cursed God.
the priests of the Levi tribe from the family of Zadok the priest are the only ones who may serve in my temple—this is my law. So give them a young bull to slaughter as a sacrifice for sin.
From then on, the priests will use this altar to offer sacrifices to please me and sacrifices to ask my blessing. Then I will be pleased with the people of Israel. I, the LORD God, have spoken.
Aaron, step up to the altar and offer the sacrifice to please the LORD, then offer the sacrifices for the forgiveness of your sins and for the sins of the people, just as the LORD has commanded.
and he is better than any other high priest. Jesus doesn't need to offer sacrifices each day for his own sins and then for the sins of the people. He offered a sacrifice once for all, when he gave himself.
Then Christ went once for all into the most holy place and freed us from sin for ever. He did this by offering his own blood instead of the blood of goats and bulls.
However, only the high priest could go into the second part of the tent, and he went in only once a year. Each time he carried blood to offer for his sins and for any sins that the people had committed without meaning to.