قُل لِلمُخَلَّفينَ مِنَ الأَعرابِ سَتُدعَونَ إِلىٰ قَومٍ أُولي بَأسٍ شَديدٍ تُقاتِلونَهُم أَو يُسلِمونَ ۖ فَإِن تُطيعوا يُؤتِكُمُ اللَّهُ أَجرًا حَسَنًا ۖ وَإِن تَتَوَلَّوا كَما تَوَلَّيتُم مِن قَبلُ يُعَذِّبكُم عَذابًا أَليمًا

Tell the Desert Arabs who stayed behind, “You will be called to a people of great warfare; you will fight them, unless they surrender. If you obey, God will grant you generous compensation. But if you turn away, as you did previously, He will inflict a severe punishment upon you.”