Surah Al-Fath, verse 16

قُل لِّلْمُخَلَّفِينَ مِنَ ٱلْأَعْرَابِ سَتُدْعَوْنَ إِلَىٰ قَوْمٍ أُو۟لِى بَأْسٍ شَدِيدٍ تُقَـٰتِلُونَهُمْ أَوْ يُسْلِمُونَ ۖ فَإِن تُطِيعُوا۟ يُؤْتِكُمُ ٱللَّهُ أَجْرًا حَسَنًا ۖ وَإِن تَتَوَلَّوْا۟ كَمَا تَوَلَّيْتُم مِّن قَبْلُ يُعَذِّبْكُمْ عَذَابًا أَلِيمًا ﴿١٦﴾

48:16 Say to the Bedouins who lagged behind, “You will be called against a people of great might, whom you will fight unless they submit. Then if you obey, Allah will give you a goodly reward, but if you turn away as you turned away before, He will afflict you with a painful punishment