Leviticus 11:39-43

‘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 regard to every swarming thing that swarms on the earth, you shall not eat them, because they are detestable.

Do not make yourselves detestable through any of the swarming things that swarm; and you shall not make yourselves unclean with them so that you become unclean.