2 Samuel 5:24

As soon as you hear the sound of marching in the tops of the balsam trees, move quickly, because this will mean that the LORD has gone out before you to strike the camp of the Philistines.”

And let it be, when thou hearest the sound of a going in the tops of the mulberry trees, that then thou shalt bestir thyself: for then shall the LORD go out before thee, to smite the host of the Philistines.