2 Chronicles 30:3
They were unable to observe it at the regular time because not enough priests had consecrated themselves and the people had not assembled in Jerusalem.
2 Chronicles 29:34
But there were not enough priests to skin all the animals, so their brothers, the Levites, helped them until the work was finished and the priests could consecrate themselves. (The Levites had been more conscientious about consecrating themselves than the priests.)
Exodus 12:6
You must care for it until the fourteenth day of this month, and then the whole community of Israel will kill it around sundown.
Exodus 12:18
In the first month, from the fourteenth day of the month, in the evening, you will eat bread made without yeast until the twenty-first day of the month in the evening.
2 Chronicles 29:17
On the first day of the first month they began consecrating; by the eighth day of the month they reached the porch of the Lord's temple. For eight more days they consecrated the Lord's temple. On the sixteenth day of the first month they were finished.