Ezekiel 44:25-27

25A priest must not defile himself by going near a dead person. However, for a father, a mother, a son, a daughter, a brother, or an unmarried sister, he may do so, 26and after he is cleansed, he must count off seven days for himself. 27And on the day he goes into the sanctuary, into the inner court, to minister in the sanctuary, he must present his sin offering, declares the Lord GOD.