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قُلْ لِلْمُخَلَّفِينَ مِنَ الْأَعْرَابِ سَتُدْعَوْنَ إِلَىٰ قَوْمٍ أُولِي بَأْسٍ شَدِيدٍ تُقَاتِلُونَهُمْ أَوْ يُسْلِمُونَ ۖ فَإِنْ تُطِيعُوا يُؤْتِكُمُ اللَّهُ أَجْرًا حَسَنًا ۖ وَإِنْ تَتَوَلَّوْا كَمَا تَوَلَّيْتُمْ مِنْ قَبْلُ يُعَذِّبْكُمْ عَذَابًا أَلِيمًا
Say to the desert Arabs who had stayed behind: "You will be called against a formidable people. You will fight them till they surrender. If you obey, then He will give you a good reward; but if you turn back, as you had done before, He will punish you with a grievous affliction."