[Machine] The Messenger of Allah ﷺ called out for an expedition against the Arabs, but they hesitated. Then, the verse was revealed: "If you do not go forth, He will punish you with a painful punishment" [Surah At-Tawbah 9:39]. The punishment mentioned here was the deprivation of rain.
رَسُولَ اللهِ ﷺ اسْتَنْفَرَ حَيًّا مِنَ الْعَرَبِ فَتَثَاقَلُوا فَنَزَلَتْ {إِلَّا تَنْفِرُوا يُعَذِّبْكُمْ عَذَابًا أَلِيمًا} [التوبة 39] قَالَ كَانَ عَذَابُهُمْ حَبْسَ الْمَطَرِ عَنْهُمْ