John Gill Commentary Leviticus 11:47

"to make a distinction between the unclean and the clean, and between the living thing that may be eaten and the living thing that may not be eaten." — Leviticus 11:47 (ASV)

To make a difference between the unclean and the clean ,
&c.] Whether of beasts, fish, fowl, and flying creeping things:

and between the beast that may be eaten, and the beast that may not
be eaten ;
the former clause takes in all in general, this instances in a particular sort of creatures; and the first mentioned of which, that might be eaten, are, that part the hoof, are cloven footed, and chew the cud; and that might not, that chew the cud, but divide not the hoof, or divide the hoof, but chew not the cud; and now, by such like descriptions and distinctions of the creatures treated of, the Israelites would be able to make a difference between the one and the other, and know what was to be eaten, and what not.