2 Chronicles 30:13-17

It turned out that there was a tremendous crowd of people when the time came in the second month to celebrate the Passover (sometimes called the Feast of Unraised Bread). First they went to work and got rid of all the pagan altars that were in Jerusalem—hauled them off and dumped them in the Kidron Valley. Then, on the fourteenth day of the second month, they slaughtered the Passover lambs. The priests and Levites weren’t ready; but now, embarrassed in their laziness, they consecrated themselves and brought Whole-Burnt-Offerings to The Temple of GOD. Ready now, they stood at their posts as designated by The Revelation of Moses the holy man; the priests sprinkled the blood the Levites handed to them. Because so many in the congregation had not properly prepared themselves by consecration and so were not qualified, the Levites took charge of the slaughter of the Passover lambs so that they would be properly consecrated to GOD.