Wala tahinoo wala tahzanoo waantumu alaAAlawna in kuntum mumineena

So do not become weak (against your enemy), nor be sad, and you will be superior (in victory) if you are indeed (true) believers.

Faint not nor grieve, for ye will overcome them if ye are (indeed) believers.

So do not weaken and do not grieve, and you will be superior if you are [true] believers.