2 Chronicles 30:17

for many are in the assembly who have not sanctified themselves, and the Levites are over the slaughtering of the passover-offerings for every one not clean, to sanctify him to Jehovah:

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;

2 Chronicles 35:3-6

and saith to the Levites -- who are teaching all Israel -- who are sanctified to Jehovah, 'Put the holy ark in the house that Solomon son of David king of Israel built; it is not to you a burden on the shoulder. 'Now, serve Jehovah your God, and His people Israel,

Treasury of Scripture Knowledge

Summary

2 Chronicles 30:17

For there were many in the congregation that were not sanctified: therefore the Levites had the charge of the killing of the passovers for every one that was not clean, to sanctify them unto the LORD.

The levites

2 Chronicles 29:34

2 Chronicles 35:3

The killing

Exodus 12:6

Bible References

The levites

The killing

'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;