The Book of Praying for Rain (Al-Istisqa')
17/6. Chapter:
The imam turning his rida' around when praying for rain
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، عَنْ سُفْيَانَ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم اسْتَسْقَى وَصَلَّى رَكْعَتَيْنِ وَقَلَبَ رِدَاءَهُ .
It was narrated from 'Abbad bin Tamim, from his paternal uncle that: The Prophet (ﷺ) prayed for rain, and prayed two rak'ahs, and turned his rida' around.
Reference : Sunan an-Nasa'i 1510In-book reference : Book 17, Hadith 7English translation : Vol. 2, Book 17, Hadith 1511