Al-Fath · 48:16

16. O Messenger! Say to those bedouins who failed to travel to Makkah with you, testing them: “You will soon be called to fighting against a strong, courageous group of people whom you shall either have to fight in the path of Allah, or they may enter into Islam without a fight. If you obey Allah in Him inviting you to fight them, He will give you a good reward, i.e. Paradise, but if you turn away from His obedience, just like you turned away from travelling with the Messenger to Makkah, He will inflict a painful punishment on you.”