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.

In the first month, on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.

And ye 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.

And let the priests also, which come near to the Lord, sanctify themselves, lest the Lord break forth upon them.

Now they began on the first day of the first month to sanctify, and on the eighth day of the month came they to the porch of the Lord: so they sanctified the house of the Lord in eight days; and in the sixteenth day of the first month they made an end.