Once a year Aaron must make peace with the Lord by putting blood on its horns. Once a year—for generations to come—blood from the offering must be placed on the altar to make peace with the Lord. It is most holy to the Lord.”
“This permanent law tells you how to make peace with the Lord once a year for all the sins the Israelites committed.” Aaron did as the Lord had commanded Moses.
But only the chief priest went into the second part of the tent. Once a year he entered and brought blood that he offered for himself and for the things that the people did wrong unintentionally.