2 Chronicles 30:17
Many people in the assembly had not made themselves holy. So the Levites had to kill the Passover lambs for all who were not clean and could not make their lambs holy for Jehovah.
2 Chronicles 29:34
Since there were not enough priests to kill all these animals, the Levites helped them until the work was finished. By then more priests had made themselves ritually clean. The Levites were more faithful in keeping ritually clean than the priests were.
Exodus 12:6
Take care of it until the fourteenth day of this month. Then at dusk, all the assembled people from the community of Israel must slaughter their animals.
2 Chronicles 35:3-6
He told the Levites, who instructed all Israel and performed ceremonies to make themselves holy to Jehovah: Put the Holy Ark in the Temple that Solomon, son of David and king of Israel, built. It should not be carried on your shoulders any longer. Serve Jehovah your God and his people Israel.