'Three Days' in the Bible

and they are there, with David, three days, eating and drinking, for their brethren have prepared for them.

either for three years -- famine, or three months to be consumed from the face of thine adversaries, even the sword of thine enemies to overtake, or three days the sword of Jehovah, even pestilence in the land, and a messenger of Jehovah destroying in all the border of Israel; and now, see; what word do I return to Him who is sending me?'