Treasury of Scripture Knowledge

Summary

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 killing

Bible References

The levites

2 Chronicles 29:34
But the priests were too few, and were not able to slay all the burnt offerings. Wherefore their brethren the Levites helped them till the work was ended, and until the priests were sanctified. For the Levites were purer-hearted to sanctify themselves then the priests.
2 Chronicles 35:3
And he said to the Levites that taught throughout all Israel and were sanctified unto the LORD, "Put the holy ark in the house which Solomon the son of David king of Israel did build; ye need not to bear it upon your shoulders. Wherefore now serve the LORD your God and his people Israel.

The killing

Exodus 12:6
And ye shall keep him inward, until the fourteenth day of the same month. And every man of the multitude of Israel shall kill him about even.