Ezra 2:62

These searched for their entries in the genealogical records, but they could not be found, so they were disqualified from the priesthood.

Numbers 3:10

You are to appoint Aaron and his sons to carry out their priestly responsibilities, but any unauthorized person who comes near the sanctuary must be put to death.”

Leviticus 21:21-23

No descendant of Aaron the priest who has a defect is to come near to present the fire offerings to the Lord. He has a defect and is not to come near to present the food of his God.

Numbers 16:39-40

So Eleazar the priest took the bronze firepans that those who were burned had presented, and they were hammered into plating for the altar,

Numbers 18:7

But you and your sons will carry out your priestly responsibilities for everything concerning the altar and for what is inside the veil, and you will do that work. I am giving you the work of the priesthood as a gift, but an unauthorized person who comes near the sanctuary will be put to death.”

Ezekiel 44:10-14

Surely the Levites who wandered away from Me when Israel went astray, and who strayed from Me after their idols, will bear the consequences of their sin.

Treasury of Scripture Knowledge

Summary

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.

Were they, as polluted, put from the priesthood

Bible References

Therefore

Leviticus 21:21
No descendant of Aaron the priest who has a defect is to come near to present the fire offerings to the Lord. He has a defect and is not to come near to present the food of his God.
Numbers 3:10
You are to appoint Aaron and his sons to carry out their priestly responsibilities, but any unauthorized person who comes near the sanctuary must be put to death.”
Numbers 16:40
just as the Lord commanded him through Moses. It was to be a reminder for the Israelites that no unauthorized person outside the lineage of Aaron should approach to offer incense before the Lord and become like Korah and his followers.
Numbers 18:7
But you and your sons will carry out your priestly responsibilities for everything concerning the altar and for what is inside the veil, and you will do that work. I am giving you the work of the priesthood as a gift, but an unauthorized person who comes near the sanctuary will be put to death.”

Were they, as polluted, put from the priesthood

Ezekiel 44:10
Surely the Levites who wandered away from Me when Israel went astray, and who strayed from Me after their idols, will bear the consequences of their sin.

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.