Leviticus 16 describes the solemn observance that became known as the Day of Atonement, or Yom Kippur. On this occasion, the high priest performed special rituals intended to cleanse the sanctuary and make atonement for the people of Israel.
The chapter begins with a warning that Aaron must not enter the innermost sanctuary whenever he chooses. Access to the Most Holy Place was restricted because it represented the special presence of God.
Before carrying out the rituals for the people, Aaron was required to wash, put on sacred garments, and present offerings for himself and his household.
The high priest therefore occupied a unique position in Israel's worship. He represented the people before God while also remaining subject to the requirements of the Law.