Ezekiel 44:25-27

The Prince, Levites, and Priests

²⁵“A priest must not defile himself by being in the presence of a dead person unless it is his father, mother, child, brother, or unmarried sister. In such cases it is permitted. ²⁶Even then, he can return to his Temple duties only after being ceremonially cleansed and then waiting for seven days. ²⁷The first day he returns to work and enters the inner courtyard and the sanctuary, he must offer a sin offering for himself, says the Sovereign Lord.