Leviticus 11:35-38

35And everything on which any part of their carcass falls shall be unclean. Whether oven or stove, it shall be broken in pieces. They are unclean and shall remain unclean for you. 36Nevertheless, a spring or a cistern holding water shall be clean, but whoever touches a carcass in them shall be unclean. 37And if any part of their carcass falls upon any seed grain that is to be sown, it is clean, 38but if water is put on the seed and any part of their carcass falls on it, it is unclean to you.

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