قُل لِّلْمُخَلَّفِينَ مِنَ الْأَعْرَابِ سَتُدْعَوْنَ إِلَى قَوْمٍ أُوْلِي بَأْسٍ شَدِيدٍ تُقَاتِلُونَهُمْ أَوْ يُسْلِمُونَ فَإِن تُطِيعُوا يُؤْتِكُمُ اللَّهُ أَجْرًا حَسَنًا وَإِن تَتَوَلَّوْا كَمَا تَوَلَّيْتُم مِّن قَبْلُ يُعَذِّبْكُمْ عَذَابًا أَلِيمًا
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سورة الفتح
(48/16) Say to the Bedouin Arabs who lagged behind that: “You shall be called (to fight) against a people possessing mighty prowess. Either you kill them, or they surrender. Then if you obey (Allah), Allah shall give you a handsome wage; and if you turn back as you turned back before, He shall torment you with a painful torment”.
Surah Al-Fath