1 Samuel 7:5-9

Then Samuel said, “Gather all Israel to Mizpah and I will pray to the LORD for you.” They gathered to Mizpah, and drew water and poured it out before the LORD, and fasted on that day and said there, “We have sinned against the LORD.” And Samuel judged the sons of Israel at Mizpah. Now when the Philistines heard that the sons of Israel had gathered to Mizpah, the lords of the Philistines went up against Israel. And when the sons of Israel heard it, they were afraid of the Philistines. Then the sons of Israel said to Samuel, “Do not cease to cry to the LORD our God for us, that He may save us from the hand of the Philistines.” Samuel took a suckling lamb and offered it for a whole burnt offering to the LORD; and Samuel cried to the LORD for Israel and the LORD answered him.