Al-Fath 48:16

Qul lilmukhallafeena mina al-aAArabisatudAAawna ila qawmin olee ba/sin shadeedin tuqatiloonahumaw yuslimoona fa-in tuteeAAoo yu/tikumu Allahuajran hasanan wa-in tatawallaw kama tawallaytum minqablu yuAAaththibkum AAathaban aleema

Say to those who remained behind of the bedouins, "You will be called to [face] a people of great military might; you may fight them, or they will submit. So if you obey, Allāh will give you a good reward; but if you turn away as you turned away before, He will punish you with a painful punishment."

Say to those of the Bedouins who remained behind, “You will be called against a people possessed of strong fighting power; you will have to fight them until they submit. So if you obey, Allah will give you a good reward, and if you turn away, as you had turned away earlier, He will punish you with a painful punishment.