NET

17 Because many in the assembly had not consecrated themselves, the Levites slaughtered the Passover lambs of all who were ceremonially unclean and could not consecrate their sacrifice to the Lord.

Darby

17 For there were many in the congregation that were not hallowed; therefore the Levites had the charge of the slaughtering of the passover-lambs for every one not clean, to hallow them unto Jehovah.

KJV

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.