Leviticus 11:36

Nevertheless , a spring or a cistern holding water shall be clean , but whoever touches a carcass in them shall be unclean .

A spring, however, or a cistern for collecting water remains clean, but anyone who touches one of these carcasses is unclean.

Nevertheless a fountain or pit, wherein there is plenty of water, shall be clean : but that which toucheth their carcase shall be unclean.