Ezekiel 44:25-27

²⁵They shall not defile themselves by going near to a dead person; however, for father or mother, for son or daughter, for brother or unmarried sister they may defile themselves. ²⁶After he is defiled, he shall count for himself seven days, and then he shall be clean. ²⁷And on the day that he goes into the holy place, into the inner court, to minister in the holy place, he shall offer his sin offering, says the Lord GOD.