Leviticus 11:35-37

New International Version

³⁵ Anything that one of their carcasses falls on becomes unclean; an oven or cooking pot must be broken up. They are unclean, and you are to regard them as unclean. ³⁶ A spring, however, or a cistern for collecting water remains clean, but anyone who touches one of these carcasses is unclean. ³⁷ If a carcass falls on any seeds that are to be planted, they remain clean.