Leviticus 11:38-40

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

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

⁴⁰And 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.