2 Chronicles 30:17
For many in the congregation were not sanctified. And the Levites were over the killing of the passovers for every one who was not clean, to sanctify them to Jehovah.
2 Chronicles 29:34
But the priests were too few, so that they could not skin all the burnt offerings. And their brothers the Levites helped them until the work was ended, and until the priests had sanctified themselves. For the Levites were more upright of heart to make themselves pure than the priests.
Exodus 12:6
And you shall keep it up until the fourteenth day of the same month. And the whole assembly of the congregation of Israel shall kill it in the evening.
2 Chronicles 35:3-6
And he said to the Levites who taught all Israel, who were holy to Jehovah, Put the holy ark in the house which Solomon the son of David, king of Israel, built. It shall not be a burden on your shoulders. And serve Jehovah your God and His people Israel,