Hadithcore
Sunan Abi Dawud, 2506
da’if· Al-Albani

Najdah bin Nufai’ said “I asked Ibn ‘Abbas about the verse. “Unless you go forth, He will punish you with a grievous penalty.” He replied “The rain stopped from them. This was their punishment.”

حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا زَيْدُ بْنُ الْحُبَابِ، عَنْ عَبْدِ الْمُؤْمِنِ بْنِ خَالِدٍ الْحَنَفِيِّ، حَدَّثَنِي نَجْدَةُ بْنُ نُفَيْعٍ، قَالَ ‏:‏ سَأَلْتُ ابْنَ عَبَّاسٍ عَنْ هَذِهِ الآيَةِ، ‏{‏ إِلاَّ تَنْفِرُوا يُعَذِّبْكُمْ عَذَابًا أَلِيمًا ‏}‏ قَالَ ‏:‏ فَأُمْسِكَ عَنْهُمُ الْمَطَرُ وَكَانَ عَذَابَهُمْ ‏.‏

References2 variants
In-Book Reference
Book 15, Hadith 30
English Reference
Book 14, Hadith 2500