Narrated Abbas bin Tamlm from his uncle who said,
"The Prophet invoked Allah for rain and offered a two Rakat prayer and he put his cloak inside out."
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم اسْتَسْقَى فَصَلَّى رَكْعَتَيْنِ، وَقَلَبَ رِدَاءَهُ.
Sahih al-Bukhari, 1026
Sahih al-Bukhari, Vol. 2, Book of Dua' for Rain (Istisqaa), Hadith 138
Sahih al-Bukhari, Book of Dua' for Rain (Istisqaa), Hadith 138