Leviticus 11:36
Nevertheless, a spring or cistern containing water will remain clean, but one who touches a carcass in it will be unclean.
Berean Standard Bible
Nevertheless a fountain or pit, wherein there is plenty of water, shall be clean: but that which toucheth their carcase shall be unclean.
Nevertheless a spring or a cistern in which water is gathered shall be clean, but that which touches their carcass shall be unclean.