Ezekiel 44:10-14

And the men of the tribe of Levi who abandoned me when Israel strayed away from me to worship idols must bear the consequences of their unfaithfulness. They may still be Temple guards and gatekeepers, and they may slaughter the animals brought for burnt offerings and be present to help the people. But they encouraged my people to worship idols, causing Israel to fall into deep sin. So I have taken a solemn oath that they must bear the consequences for their sins, says the Sovereign LORD. They may not approach me to minister as priests. They may not touch any of my holy things or the holy offerings, for they must bear the shame of all the detestable sins they have committed. They are to serve as the Temple caretakers, taking charge of the maintenance work and performing general duties.