Leviticus 11:43

Ye shall not make yourselves abominable with any creeping
thing that creepeth
With any creeping thing that flies in the air, excepting the four sorts of locusts, ( Leviticus 11:22 ) and with any creeping thing in the waters, ( Leviticus 11:10 ) or with anything that creeps on the land, by eating any of them; which being abominable for food, would make the eater of them so to God, he thereby breaking a command of his:

neither shall you make yourselves unclean with them;
by touching and bearing them, as with dead beasts, so with dead flies and the like:

that ye should be defiled thereby;
in a ceremonial sense.