2 Chronicles 30:3
for they have not been able to make it at that time, for the priests have not sanctified themselves sufficiently, and the people have not been gathered to Jerusalem.
2 Chronicles 29:34
Only, the priests have become few, and have not been able to strip the whole of the burnt-offerings, and their brethren the Levites strengthen them till the completion of the work, and till the priests sanctify themselves, for the Levites are more upright of heart to sanctify themselves than the priests.
Exodus 12:6
'And it hath become a charge to you, until the fourteenth day of this month, and the whole assembly of the company of Israel have slaughtered it between the evenings;
Exodus 12:18
In the first month, in the fourteenth day of the month, in the evening, ye do eat unleavened things until the one and twentieth day of the month, at evening;
2 Chronicles 29:17
And they begin on the first of the first month to sanctify, and on the eighth day of the month they have come to the porch of Jehovah, and they sanctify the house of Jehovah in eight days, and on the sixteenth day of the first month they have finished.