Leviticus 11:24, 43-44

‘By these you shall become unclean; whoever touches the carcass of any of them shall be unclean until evening

You shall not make yourselves abominable with any creeping thing that creeps; nor shall you make yourselves unclean with them, lest you be defiled by them. For I am the LORD your God. You shall therefore consecrate yourselves, and you shall be holy; for I am holy. Neither shall you defile yourselves with any creeping thing that creeps on the earth.