2 Chronicles 30:3
For they could not keep it at that time, because the priests had not sanctified themselves in sufficient number, neither had the people gathered themselves together to Jerusalem.
2 Chronicles 29:34
But the priests were too few, so that they could not skin all the burnt-offerings. Therefore their brothers the Levites helped them till the work was ended, and until the priests had sanctified themselves. For the Levites were more
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 evening.
Exodus 12:18
In the first [month], on the fourteenth day of the month at evening, ye shall eat unleavened bread, until the twenty-first day of the month at evening.
2 Chronicles 29:17
Now they began on the first [day] of the first month to sanctify, and on the eighth day of the month they came to the porch of LORD. And they sanctified the house of LORD in eight days, and on the sixteenth day of the first month t