The lightning requires rain
Al-Kāfi|Volume 8|Book 1|Chapter 267
جَعْفَرُ بْنُ بَشِيرٍ عَنْ رُزَيْقٍ عَنْ أَبِي عَبْدِ اللَّهِ (عليه السلام) قَالَ مَا أَبْرَقَتْ قَطُّ فِي ظُلْمَةِ لَيْلٍ وَ لَا ضَوْءِ نَهَارٍ إِلَّا وَ هِيَ مَاطِرَةٌ.
267. Ja’far Bin Basheer, from Ruzeyq, who has reported the following: Abu Abdullah عليه الصلاة والسلام has said: ‘Lightning does not occur at all in the darkness of the night or the light of the day unless it is raining’.
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (16/141)
- Ṣaḥīḥ al-Kāfī