Leviticus 11:36-38

Complete Jewish Bible

³⁶ although a spring or cistern for collecting water remains clean. But anyone who touches one of their carcasses will become unclean. ³⁷ If any carcass-part of theirs falls on any kind of seed to be sown, it is clean; ³⁸ but if water is put on the seed and a carcass-part of theirs falls on it, it is unclean for you.