Ezra 2:62
These sought their genealogical register, but they were not found; therefore were they, as polluted, removed from the priesthood.
Numbers 3:10
And Aaron and his sons shalt thou appoint that they may attend to their priest's office; and the stranger that cometh near shall be put to death.
Leviticus 21:21-23
No man of the seed of Aaron the priest that hath defect shall come near to present Jehovah's offerings by fire: he hath a defect; he shall not come near to present the bread of his God.
Numbers 16:39-40
And Eleazar the priest took the copper censers, which they that were burnt had presented; and they were made broad plates for a covering of the altar:
Numbers 18:7
But thou and thy sons with thee shall attend to your priesthood for all that concerneth the altar, and for that which is inside the veil; and ye shall perform the service: I give you your priesthood as a service of gift, and the stranger that cometh near shall be put to death.
Ezekiel 44:10-14
But the Levites who went away far from me, when Israel went astray, going astray from me after their idols, they shall even bear their iniquity;