John Gill Commentary Numbers 4:18

"Cut ye not off the tribe of the families of the Kohathites from among the Levites;" — Numbers 4:18 (ASV)

Cut you not off the tribe of the families of the Kohathites
from among the Levites .
] Or give no occasion, as the Targum of Jonathan; or be not the cause of their cutting off, as Jarchi, through negligence or inadvertency of theirs, in packing up the above things, and delivering them to them.