Sunan an-Nasa'i, Volume 2, Book 17, Hadith 1523 (DarusSalam) ⓘ
It was narrated from 'Abbad bin Tamim from his paternal uncle that: The Prophet went out and prayed for rain, then he prayed two rak'ahs in which he recited loudly.
أَخْبَرَنَا مُحَمَّدُ بْنُ رَافِعٍ، قَالَ حَدَّثَنَا يَحْيَى بْنُ آدَمَ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ ابْنِ أَبِي ذِئْبٍ، عَنِ الزُّهْرِيِّ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم خَرَجَ فَاسْتَسْقَى فَصَلَّى رَكْعَتَيْنِ جَهَرَ فِيهِمَا بِالْقِرَاءَةِ .
also referenced under: Hadith 1522 (Reference) & Book 17, Hadith 19 (In-Book)