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

Najdah ibn Nufay' said: I asked Ibn 'Abbas about this verse: "If you do not go forth, He will punish you with a painful punishment." He said: Rain was withheld from them, and that was their punishment.