Leviticus 26:36-37

36And as to those that remain of you — I will send faintness into their hearts in the lands of their enemies, that the sound of a driven leaf shall chase them, and they shall flee, as fleeing from a sword; and they shall fall when none pursueth;

37and they shall stumble one over another, as it were before a sword, when none pursueth; and ye shall have no power to stand before your enemies.