Judith 7:12–13

12 Remain in your camp, and keep all the men in your forces with you; only let your servants take possession of the spring of water that flows from the foot of the mountain— 13 for this is where all the people of Bethulia get their water. So thirst will destroy them, and they will give up their city. We and our people will go up to the tops of the nearby mountains and camp there to keep watch that not a man gets out of the city.