II-Chronicles

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 other priests had sanctified themselves: for the Levites were more upright in heart to sanctify themselves than the priests.

And the Lord said unto Moses, Go unto the people, and sanctify them to day and to morrow, and let them wash their clothes,

And said unto the Levites that taught all Israel, which were holy unto the Lord, Put the holy ark in the house which Solomon the son of David king of Israel did build; it shall not be a burden upon your shoulders: serve now the Lord your God, and his people Israel,

So kill the passover, and sanctify yourselves, and prepare your brethren, that they may do according to the word of the Lord by the hand of Moses.

For because ye did it not at the first, the Lord our God made a breach upon us, for that we sought him not after the due order.