Ezra 2:62
These looked for their register among those who were counted by genealogy, but they were not found. Therefore they were polluted from the priesthood.
Numbers 3:10
And you shall appoint Aaron and his sons, and they shall wait on their priest's office. And the stranger who comes near shall be put to death.
Leviticus 21:21-23
No man of the seed of Aaron, the priest, in whom there is a blemish shall come near to offer the fire offerings of Jehovah. 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 bronze fire-pans, the ones with which those who had been burned up had offered, and they were made into broad plates, a covering of the altar,
Numbers 18:7
Therefore you and your sons with you shall keep your priests' office for everything of the altar and inside the veil. And you shall serve. I have given your priest's office as a service of gift. And the stranger that comes near shall be put to death.
Ezekiel 44:10-14
But the Levites who have gone far away from Me, when Israel went astray; those who went astray from Me after their idols; they shall even bear their iniquity.