Leviticus 11:35-38

11:35 Anything their carcass may fall on will become unclean. An oven or small stove must be smashed to pieces; they are unclean, and they will stay unclean to you. 11:36 However, a spring or a cistern which collects water will be clean, but one who touches their carcass will be unclean. 11:37 Now, if such a carcass falls on any sowing seed which is to be sown, it is clean, 11:38 but if water is put on the seed and such a carcass falls on it, it is unclean to you.