2 Chronicles 30:17
For there were many in the assembly who had not sanctified themselves: therefore the Levites were in charge of killing the Passovers for everyone who was not clean, to sanctify them to Yahweh.
2 Chronicles 29:34
But the priests were too few, so that they could not flay all the burnt offerings: therefore their brothers the Levites helped them, until the work was ended, and until the priests had sanctified themselves; for the Levites were more upright in heart to sanctify themselves than the priests.
Exodus 12:6
and you shall keep it until the fourteenth day of the same month; and the whole assembly of the congregation of Israel shall kill it at evening.
2 Chronicles 35:3-6
He said to the Levites who taught all Israel, who were holy to Yahweh, "Put the holy ark in the house which Solomon the son of David king of Israel built. There shall no more be a burden on your shoulders. Now serve Yahweh your God, and his people Israel.