Passover: The Lamb Killed by Levites, for Those Who Were Ceremonially Unclean
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2 Chronicles 30:17
Since there were many in the assembly who had not consecrated themselves, the Levites were in charge of slaughtering the Passover lambs for every unclean person to consecrate the lambs to the LORD.
2 Chronicles 35:3–11
To the Levites who taught all Israel and were holy to the LORD, Josiah said: “Put the holy ark in the temple built by Solomon son of David king of Israel. It is not to be carried around on your shoulders. Now serve the LORD your God and His people Israel. / Prepare yourselves by families in your divisions, according to the instructions written by David king of Israel and Solomon his son. / Moreover, stand in the Holy Place by the divisions of the families of your kinsmen the lay people, and by the divisions of the families of the Levites.
Ezra 6:20
All the priests and Levites had purified themselves and were ceremonially clean. And the Levites slaughtered the Passover lamb for all the exiles, for their priestly brothers, and for themselves.