I Samuel 7:7-9

Now when the Philistines heard that the children of Israel had gathered together at Mizpah, the lords of the Philistines went up against Israel. And when the children of Israel heard of it, they were afraid of the Philistines. So the children of Israel said to Samuel, “Do not cease to cry out to the LORD our God for us, that He may save us from the hand of the Philistines.” And Samuel took a suckling lamb and offered it as a whole burnt offering to the LORD. Then Samuel cried out to the LORD for Israel, and the LORD answered him.