Leviticus 26:36-37

36As for those of you who survive, I will send a faintness into their hearts in the lands of their enemies, so that even the sound of a windblown leaf will put them to flight. And they will flee as one flees the sword, and fall when no one pursues them. 37They will stumble over one another as before the sword, though no one is behind them. So you will not be able to stand against your enemies.