2 Chronicles 30:3
For they could not keep it at that time, because there were not enough priests sanctified, neither had the people gathered themselves together to Jerusalem.
2 Chronicles 29:34
But the priests were too few so that they could not flay all the burnt offerings; therefore, their brethren, the Levites, helped them until 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.
Exodus 12:6
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 between the two evenings.
Exodus 12:18
In the first month, on the fourteenth day of the month in the evening, ye shall eat unleavened bread until the twenty-first day of the month in the evening.
2 Chronicles 29:17
Now they began to sanctify on the first day of the first month, and on the eighth day of the month they came to the porch of the LORD; and they sanctified the house of the LORD in eight days; and in the sixteenth day of the first month they finished.