2 Chronicles 30:3
For they could not keep it at that time: for there were not priests enough sanctified, neither was the people gathered together to Jerusalem.
2 Chronicles 29:34
But the priests were too few, and were not able to slay all the burnt offerings. Wherefore their brethren the Levites helped them till the work was ended, and until the priests were sanctified. For the Levites were purer-hearted to sanctify themselves then the priests.
Exodus 12:6
And ye shall keep him inward, until the fourteenth day of the same month. And every man of the multitude of Israel shall kill him about even.
Exodus 12:18
The first month and the fourteenth day of the month at even, ye shall eat sweet bread unto the twenty-first day of the month at even again.
2 Chronicles 29:17
They began the first day of the first month to purify, and came the eighth day to the porch of the LORD: so that they had purged the house of the LORD in eight days; in the sixteenth day of the first month they made an end.