Ezekiel 44:25-27

“A priest must not contaminate himself by going near a corpse. But when the dead person is his father or mother, son or daughter, brother or unmarried sister, he can approach the dead. But after he has been purified, he must wait another seven days. Then, when he returns to the inside courtyard of the Sanctuary to do his priestly work in the Sanctuary, he must first offer a sin offering for himself. Decree of GOD, the Master.