Surah Al-Fath, ayah 16

قُل لِّلۡمُخَلَّفِينَ مِنَ ٱلۡأَعۡرَابِ سَتُدۡعَوۡنَ إِلَىٰ قَوۡمٍ أُوْلِي بَأۡسٖ شَدِيدٖ تُقَٰتِلُونَهُمۡ أَوۡ يُسۡلِمُونَۖ فَإِن تُطِيعُواْ يُؤۡتِكُمُ ٱللَّهُ أَجۡرًا حَسَنٗاۖ وَإِن تَتَوَلَّوۡاْ كَمَا تَوَلَّيۡتُم مِّن قَبۡلُ يُعَذِّبۡكُمۡ عَذَابًا أَلِيمٗا ١٦

Qul lil-mukhallafīna minal-a'rābi satud'awna ilā qawmin ulī ba sin shadīdin tuqātilūnahum aw yuslimūna fa in tutī'ū yu'tikumullāhu ajran hasanan wa in tatawallaw kamā tawallaytum min qablu yu'addhibkum 'adhāban alīmā

Say to those who remained behind of the bedouins, "You will be called to [face] a people of great military might; you may fight them, or they will submit.¹⁵¹³ So if you obey, Allāh will give you a good reward; but if you turn away as you turned away before, He will punish you with a painful punishment."