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.”

Read 2 Samuel 5:24 Using Other Translations

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.
And when you hear the sound of marching in the tops of the balsam trees, then rouse yourself, for then the LORD has gone out before you to strike down the army of the Philistines."
When you hear a sound like marching feet in the tops of the poplar trees, be on the alert! That will be the signal that the LORD is moving ahead of you to strike down the Philistine army.”