2 Chronicles 30:15-17

15They slaughtered the Passover lamb on the fourteenth day of the second month. The priests and Levites were ashamed, and they consecrated themselves and brought burnt offerings to the Lord’s temple.

16They stood at their prescribed posts, according to the law of Moses, the man of God. The priests splattered the blood received from the Levites,

17for there were many in the assembly who had not consecrated themselves, and so the Levites were in charge of slaughtering the Passover lambs for every unclean person to consecrate the lambs to the Lord.