Wherefore gloriest thou in the valleys, thy flowing [with blood] valley, O backsliding daughter?

He opened the rock, and waters gushed out; they ran, a river in the dry places.

Rabbi Yitzhak says: "It's a [rabbinic] decree because of [fruit] juice that flows [out on Yom Tov]."

And if a woman have an issue of her blood [lit. her blood-issue flows] many days not in the time of her impurity …

If you prick us, do we not bleed?

The wound discharged pus.