John Gill Commentary Ezekiel 44:27

"And in the day that he goeth into the sanctuary, into the inner court, to minister in the sanctuary, he shall offer his sin-offering, saith the Lord Jehovah." — Ezekiel 44:27 (ASV)

And in the day that he goes into the sanctuary Into the house and church of God, after his cleansing, and when the seven days thereafter are up:

unto the inner court, to minister in the sanctuary; among the inward court worshippers, to minister in things to them; to preach the Gospel, and administer Gospel ordinances:

he shall offer his sin offering, says the Lord God; though he has been privately cleansed in the fountain of Christ's blood, in which he has washed for sin and uncleanness; yet when he comes into the house of the Lord, he must acknowledge his sins and imperfections over Christ the sin offering; which he must bring in the arms of his faith, and so enter into the courts of the living God, and do the service of the sanctuary.