Ezra 2:62
These sought their registration [among] those that were reckoned by genealogy, but they were not found. Therefore were they deemed polluted and put away from the priesthood.
Numbers 3:10
And thou shall appoint Aaron and his sons, and they shall keep their priesthood. And the stranger who comes near shall be put to death.
Leviticus 21:21-23
No man of the seed of Aaron the priest, who has a blemish, shall come near to offer the offerings of LORD made by fire; he has a blemish, he shall not come near to offer the bread of his God.
Numbers 16:39-40
And Eleazar the priest took the brazen censers, which those who were burnt had offered, and they beat them out for a covering of the altar,
Numbers 18:7
And thou and thy sons with thee shall keep your priesthood for everything of the altar, and for that within the veil, and ye shall serve. I give you the priesthood as a service of gift. And the stranger who comes near shall be put
Ezekiel 44:10-14
But the Levites who went far from me, when Israel went astray, who went astray from me after their idols, they shall bear their iniquity.