Ezekiel 44:25-27

25“‘They must not come near a dead person or they will be defiled; however, for father, mother, son, daughter, brother or sister, they may defile themselves.

26After a priest has become ceremonially clean, they must count off a period of seven days for him.

27On the day he enters the sanctuary, into the inner court to serve in the sanctuary, he must offer his sin offering, declares the sovereign Lord.