1 Chronicles 14:8-10

The minute the Philistines heard that David had been made king over a united Israel, they went out in force to capture David. When David got the report, he marched out to confront them. On their way, the Philistines stopped off to plunder the Valley of Rephaim. David prayed to God: “Is this the right time to attack the Philistines? Will you give me the victory?” GOD answered, “Attack; I’ll give you the victory.”