The Prayer for Seeking Rain (Salat Al-Istisqa)
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 80
وَ رَوَى سَعْدَانُ عَنْهُ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «مَا مِنْ قَطْرَةٍ تَنْزِلُ مِنَ اَلسَّمَاءِ إِلاَّ وَ مَعَهَا مَلَكٌ يَضَعُهَا اَلْمَوْضِعَ اَلَّذِي قُدِّرَتْ لَهُ.
Sa'dan narrated from him عليه السلام that He said: "There is no drop of rain that falls from the sky except that there is an angel accompanying it, placing it precisely in the location that has been decreed for it."
- Ṣaḥīḥ al-Faqīh