II Samuel 5:24

24 As soon as you hear the sound of marching in the tops of the poplar trees, move quickly, because that will mean the Lord has gone out in front of you to strike the Philistine army."

24 And it shall be, when thou hearest the sound of marching in the tops of the mulberry-trees, that then thou shalt bestir thyself; for then is Jehovah gone out before thee to smite the host of the Philistines.