'Mulberries' in the Bible

and David asketh of Jehovah, and He saith, 'Thou dost not go up, turn round unto their rear, and thou hast come to them over-against the mulberries,

and it cometh to pass, in thy hearing the sound of a stepping in the tops of the mulberries, then thou dost move sharply, for then hath Jehovah gone out before thee to smite in the camp of the Philistines.'