2 Chronicles 30:17
For there were many in the assembly that had not sanctified themselves: therefore the Levites had the charge of killing the passovers for every one that was not clean, to sanctify them unto Jehovah.
2 Chronicles 29:34
But the priests were too few, so that they could not flay all the burnt-offerings: wherefore their brethren the Levites did help them, till 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 ye shall keep it until the fourteenth day of the same month; and the whole assembly of the congregation of Israel shall kill it at even.
2 Chronicles 35:3-6
And he said unto the Levites that taught all Israel, that were holy unto Jehovah, Put the holy ark in the house which Solomon the son of David king of Israel did build; there shall no more be a burden upon your shoulders: now serve Jehovah your God, and his people Israel.