Leviticus 11:40

37 If any part of the dead body of one of these gets on to any seed for planting, it is clean;

38 But if water is put on the seed, and any part of the dead body gets on to it, it will be unclean to you.

39 And if any beast which may be used for food comes to a natural death, anyone touching its dead body will be unclean till evening.

40 And he who makes use of any part of its body for food is to have his clothing washed and be unclean till evening; and anyone taking away its body is to have his clothing washed and be unclean till evening.

41 Everything which goes flat on its body on the earth is disgusting, and is not to be used for food.

42 Whatever goes on its stomach or on four feet or has a great number of feet, even all those going flat on the earth, may not be used for food, for they are disgusting.

43 You are not to make yourselves disgusting with anything which goes about flat on the earth; you may not make yourselves unclean with them, in such a way that you are not holy to me.