Sahih al-Bukhari 1027
Sahih al-Bukhari · Book 15: Invoking Allah for Rain (Istisqaa) · To offer the Istisqa' prayer at the Musalla
Narrated `Abbad bin Tamim from his uncle who said:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ ، قَالَ حَدَّثَنَا سُفْيَانُ ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ ، سَمِعَ عَبَّادَ بْنَ تَمِيمٍ ، عَنْ عَمِّهِ ، قَالَ خَرَجَ النَّبِيُّ صلى الله عليه وسلم إِلَى الْمُصَلَّى يَسْتَسْقِي، وَاسْتَقْبَلَ الْقِبْلَةَ فَصَلَّى رَكْعَتَيْنِ، وَقَلَبَ رِدَاءَهُ. قَالَ سُفْيَانُ فَأَخْبَرَنِي الْمَسْعُودِيُّ عَنْ أَبِي بَكْرٍ قَالَ جَعَلَ الْيَمِينَ عَلَى الشِّمَالِ .
"The Prophet (ﷺ) went out to the Musalla to offer the Istisqa' prayer, faced the Qibla and offered a two rak`at prayer and turned his cloak inside out." Narrated Abu Bakr, "The Prophet (ﷺ) put the right side of his cloak on his left side."