2 Samuel 5:22-25

22And the Philistines came up yet again, and spread themselves in the valley of Rephaim. 23And David inquired of Jehovah; and he said, Thou shalt not go up; turn round behind them and come upon them opposite the mulberry-trees. 24And it shall be, when thou hearest a sound of marching in the tops of the mulberry-trees, that then thou shalt bestir thyself; for then will Jehovah have gone forth before thee, to smite the army of the Philistines. 25And David did so, as Jehovah had commanded him; and smote the Philistines from Geba until thou comest to Gezer.