Leviticus 11:35-38

³⁵And anything upon which a part of their dead bodies may have fallen shall be unclean; oven or cooking pan, they shall be broken, they are unclean and shall be unclean to you.

³⁶Nevertheless, a fountain or a pit, the place of a collection of waters, (into which they may have fallen,) shall be clean; but he who toucheth their dead bodies shall be unclean.

³⁷And if a part of their carcase fall upon any seeding seed which is to be sown, it is clean;

³⁸But if water be put upon the seed, and a part of their carcase fall their fall thereupon, it is unclean to you.