Ezekiel 44:25-27

“ ‘A priest must not defile himself by going near a dead person; however, if the dead person was his father or mother, son or daughter, brother or unmarried sister, then he may defile himself. After he is cleansed, he must wait seven days. On the day he goes into the inner court of the sanctuary to minister in the sanctuary, he is to offer a sin offering for himself, declares the Sovereign LORD.