Ezra 2:62
These sought their register among those that were reckoned by genealogy, but they were not found: therefore were they, as polluted, put from the priesthood.
Numbers 3:10
And thou shalt appoint Aaron and his sons, and they shall wait on their priest's office: and the stranger that cometh nigh shall be put to death.
Leviticus 21:21-23
No man of the seed of Aaron the priest, that hath a blemish, shall come nigh to offer the offerings of the LORD made by fire; he hath a blemish, he shall not come nigh to offer the bread of his God.
Numbers 16:39-40
And Eleazar the priest took the brazen censers, with which they that were burnt had offered; and they were made broad plates for a covering of the altar:
Numbers 18:7
Therefore thou and thy sons with thee shall keep your priest's office for every thing of the altar, and within the vail; and ye shall serve: I have given your priest's office to you as a service of gift: and the stranger that cometh nigh shall be put to death.
Ezekiel 44:10-14
And the Levites that have gone away far from me, when Israel went astray, who went astray from me after their idols; they shall even bear their iniquity.