Surah Al-Fath, Verse 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 أَلِيمٗا١٦

qul lil'mukhallafīna mina l-aʿrābi satud'ʿawna ilā qawmin ulī basin shadīdin tuqātilūnahum aw yus'limūna fa-in tuṭīʿū yu'tikumu l-lahu ajran ḥasanan wa-in tatawallaw kamā tawallaytum min qablu yuʿadhib'kum ʿadhāban alīman

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. 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."