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.
BSB
Since there were many in the assembly who had not consecrated themselves, the Levites were in charge of slaughtering the Passover lambs for every unclean person to consecrate the lambs to the LORD.
WEB
For there were many in the assembly who had not sanctified themselves: therefore the Levites were in charge of killing the Passovers for everyone who was not clean, to sanctify them to Yahweh.
YLT
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: