Leviticus 11:33-37

As for any earthenware vessel into which one of them may fall, whatever is in it becomes unclean and you shall break the vessel.

Any of the food which may be eaten, on which water comes, shall become unclean, and any liquid which may be drunk in every vessel shall become unclean.

Moreover, everything on which part of their carcass may fall becomes unclean; an oven or a stove shall be smashed; they are unclean and shall continue as unclean to you.

Nevertheless, a spring or a cistern collecting water shall be clean, though the one who touches their carcass shall be unclean.

Now if a part of their carcass falls on any seed for sowing which is to be sown, it is clean.