قُلْ لِّلْمُخَلَّفِيْنَ مِنَ الْاَعْرَابِ سَتُدْعَوْنَ اِلٰي قَوْمٍ اُولِيْ بَاْسٍ شَدِيْدٍ تُقَاتِلُوْنَهُمْ اَوْ يُسْلِمُوْنَۚ فَاِنْ تُطِيْعُوْا يُو͏ٔ͏ْتِكُمُ اللّٰهُ اَجْرًا حَسَنًاۚ وَاِنْ تَتَوَلَّوْا كَمَا تَوَلَّيْتُمْ مِّنْ قَبْلُ يُعَذِّبْكُمْ عَذَابًا اَلِيْمًا ١٦
Translation
Say to the Bedouins who stayed behind, ‘[Later on] you will be called against a people of a great might: they will either embrace Islam, or you will fight them. So if you obey, Allah will give you a good reward; but if you turn away like you turned away before, He will punish you with a painful punishment.’