Wa laa tahinoo fibtighaaa'il qawmi in takoonoo taalamoona fa innahum yaalamoona kamaa taalamoona wa tarjoona minal laahi maa laa yarjoon; wa kaanal laahu 'Aleeman Hakeemaa
And do not weaken in pursuit of the enemy. If you should be suffering - so are they suffering as you are suffering, but you expect from Allah that which they expect not. And Allah is ever Knowing and Wise.