1SA 7:6

6 So they gathered at Mizpah, which was the town where Samuel previously was the leader of the Israeli people. They had a big ceremony there. They drew water [from a well], and poured the water on the ground while Yahweh watched. [To show that they were sorry for having worshiped idols], they did not eat any food on that day, and they confessed that they had sinned against Yahweh.