'Fountain' in the Bible

and he shall offer it before Yahweh, and make atonement for her; and she shall be cleansed from the fountain of her blood. "'This is the law for her who bears, whether a male or a female.

"'If a man lies with a woman having her monthly period, and uncovers her nakedness; he has made naked her fountain, and she has uncovered the fountain of her blood: and both of them shall be cut off from among their people.