Surah Al-Fath 48:16

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

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."

Translation: Saheeh International

Tafsir

Say to those of the Bedouins mentioned who were left behind to test them ‘You shall be called against a people possessed of great might — these are said to have been the tribe of Banū Hanīfa the inhabitants of the region of al-Yamāma; …

Excerpt from Tafsir al-Jalalayn, commentary on 48:16, via Quran.com. The reader has the full commentary and 9 more tafsirs.