1 Samuel 7:4-7

So the Israelites got rid of their images of Baal and Ashtoreth and worshiped only the LORD. Then Samuel told them, “Gather all of Israel to Mizpah, and I will pray to the LORD for you.” So they gathered at Mizpah and, in a great ceremony, drew water from a well and poured it out before the LORD. They also went without food all day and confessed that they had sinned against the LORD. (It was at Mizpah that Samuel became Israel’s judge.) When the Philistine rulers heard that Israel had gathered at Mizpah, they mobilized their army and advanced. The Israelites were badly frightened when they learned that the Philistines were approaching.