Leviticus 11:39-47

‘Also if one of the animals dies which you have for food, the one who touches its carcass becomes unclean until evening. He too, who eats some of its carcass shall wash his clothes and be unclean until evening, and the one who picks up its carcass shall wash his clothes and be unclean until evening. ‘Now every swarming thing that swarms on the earth is detestable, not to be eaten. Whatever crawls on its belly, and whatever walks on all fours, whatever has many feet, in respect to every swarming thing that swarms on the earth, you shall not eat them, for they are detestable. Do not render yourselves detestable through any of the swarming things that swarm; and you shall not make yourselves unclean with them so that you become unclean. For I am the LORD your God. Consecrate yourselves therefore, and be holy, for I am holy. And you shall not make yourselves unclean with any of the swarming things that swarm on the earth. For I am the LORD who brought you up from the land of Egypt to be your God; thus you shall be holy, for I am holy.’ ” This is the law regarding the animal and the bird, and every living thing that moves in the waters and everything that swarms on the earth, to make a distinction between the unclean and the clean, and between the edible creature and the creature which is not to be eaten.