2 Chronicles 30:17
For there were many in the assembly who had not consecrated themselves. Therefore the Levites had to slaughter the Passover lamb for everyone who was not clean, to consecrate it to the LORD.
2 Chronicles 29:34
But the priests were too few and could not flay all the burnt offerings, so until other priests had consecrated themselves, their brothers the Levites helped them, until the work was finished--for the Levites were more upright in heart than the priests in consecrating themselves.
Exodus 12:6
and you shall keep it until the fourteenth day of this month, when the whole assembly of the congregation of Israel shall kill their lambs at twilight.
2 Chronicles 35:3-6
And he said to the Levites who taught all Israel and who were holy to the LORD, "Put the holy ark in the house that Solomon the son of David, king of Israel, built. You need not carry it on your shoulders. Now serve the LORD your God and his people Israel.