Sunan an-Nasa'i, Volume 2, Book 17, Hadith 1511 (DarusSalam) ⓘ
It was narrated from 'Abbad bin Tamim, from his paternal uncle that: The Prophet prayed for rain, and prayed two rak'ahs, and turned his rida' around.
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 .
also referenced under: Hadith 1510 (Reference) & Book 17, Hadith 7 (In-Book)