Ezekiel 44:10-11, 14

For the Levites who abandoned me when Israel turned their backs on me to worship their false gods must bear the consequences of their own sin. They may serve me in my sanctuary by being temple gatekeepers and temple servants. They may kill the animals the people bring to offer as burnt offerings and sacrifices for the people and by serving the worshipers in the temple.

I will, however, assign them the responsibility of performing temple duties in the outer court. I will make them responsible for serving the temple and the work to be done in it.”