Even for a distinction between the holy and unholy, and between the unclean and clean

to make a difference between the unclean and the clean, and between the creature that may be eaten and the creature that may not be eaten.

And you shall make a difference between clean animals and unclean, and between unclean fowls and clean. And you shall not defile your souls by beast, or by fowl, or by any kind of living thing that creeps on the ground, which I have separated from you as unclean.