Yahweh, via Ezekiel, wanted them to purify the sanctuary on the 1st day of the 1st month. In other words, this would be a New Year’s Day activity. They were to take an unblemished bull and use him to cleanse the sanctuary at the start of the new year. The priest should take some of the blood from the sin offering and put it on the doorposts of the Temple, as well as the four corners of the altar ledge and the posts of the gate of the inner court. The priest was also supposed to do this same ritual on the 7th day of the month for anyone who sinned inadvertently by error or ignorance. This purification ritual of the first day of the first month of the year would make an atonement for the Temple, so that it would be purified.
The first thing to be done on this new altar, after it was erected for offerings, was a burnt offering. The Levitical priests of the family of Zadok was based on a righteous priest, who was descended from Eleazar, the son of Aaron. Zadok had aided King David during the revolt of his son Absalom in 2 Samuel, chapters 13-22. Then this Zadok helped bring King Solomon to the throne in 1 Kings, chapters 1-2. After Solomon’s building of The First Temple in Jerusalem, Zadok was the first High Priest to serve there in 1 Kings, chapter 4. Thus, it was not strange that the house of Zadok occupied the high priesthood throughout much of the Second Temple period. These Levitical priests were the ones who came near to Yahweh to minister to him. The first of the sin offerings was a bull. These Zadok Levitical priests were to put its blood on the 4 horns of the altar, plus on the rim all around it for a purification and an atonement at the same time.