Remember how in the past you were not allowed to fight back and were ordered just to worship God and engage in charitable actions. As soon as you were permitted to defend yourselves, some feared mankind more than God and complained to their Lord saying: “Why have you put this burden of fighting [and being killed] upon us? Could you not give us a break?” Say: “This world is too short compared to Hereafter. Besides, God will never treat the righteous ones with the least injustice [and will reward you generously if you become a martyr in the battle field.]