Leviticus 11:36
Nevertheless a fountain or pit, wherein there is plenty of water, shall be clean: but that which toucheth their carcass shall be unclean.
Leviticus 20:18
And if a man shall lie with a woman having her sickness, and shall uncover her nakedness; he hath discovered her fountain, and she hath uncovered the fountain of her blood: and both of them shall be cut off from among their people.