The Prayer for Seeking Rain (Salat Al-Istisqa)
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 80
وَقَالَ عَلَيْهِ اَلسَّلاَمُ: «اَلرَّعْدُ صَوْتُ اَلْمَلَكِ وَ اَلْبَرْقُ سَوْطُهُ.
Imam عليه السلام said: "The thunder is the voice of the angel, and the lightning is his whip."
- Ṣaḥīḥ al-Faqīh