2 Chronicles 30:17
And because there were many in the congregation that were not sanctified: and therefore did the Levites slay Passover for all that were not clean to sanctify them to the LORD.
2 Chronicles 29:34
But the priests were too few, and were not able to slay all the burnt offerings. Wherefore their brethren the Levites helped them till the work was ended, and until the priests were sanctified. For the Levites were purer-hearted to sanctify themselves then the priests.
Exodus 12:6
And ye shall keep him inward, until the fourteenth day of the same month. And every man of the multitude of Israel shall kill him about even.
2 Chronicles 35:3-6
And he said to the Levites that taught throughout all Israel and were sanctified unto the LORD, "Put the holy ark in the house which Solomon the son of David king of Israel did build; ye need not to bear it upon your shoulders. Wherefore now serve the LORD your God and his people Israel.