Ezekiel 44:25-27

The Zadokite priests would not be able to have any contact with a dead corpse except in the case of their own immediate families (cf. Leviticus 21:1-3). People will die during the Millennium (cf. Isaiah 65:20), but no one will die in the eternal state (Revelation 21:4). After his initial cleansing from the defilement caused by contact with a corpse, the priest would have to wait seven days before resuming his priestly duties (cf. Numbers 19:11-19). On his first day of service after his cleansing, he would have to go into the inner court and offer a sin offering for himself.