1 Samuel 7:7-9

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