Sahih al-Bukhari 1005
Book 15: Invoking Allah for Rain (Istisqaa) · Narrated by `Abbad bin Tamim's uncle
Arabic
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ، قَالَ خَرَجَ النَّبِيُّ صلى الله عليه وسلم يَسْتَسْقِي وَحَوَّلَ رِدَاءَهُ.
English translation
Narrated `Abbad bin Tamim's uncle:The Prophet (ﷺ) went out to offer the Istisqa' prayer and turned (and put on) his cloak inside out
Reference: Sahih al-Bukhari 1005, Book of Invoking Allah for Rain (Istisqaa). English translation by Dr. Muhammad Muhsin Khan.