Ezekiel 44:25-27

²⁵And they shall go in to no dead person to defile themselves; but for father, or for mother, or for son, or for daughter, for brother, or for sister that hath had no husband, they may defile themselves. ²⁶And after he is cleansed, they shall reckon unto him seven days. ²⁷And 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.