(15) باب الدُّعَاءِ فِي الاِسْتِسْقَاءِ قَائِمًا
Narrated 'Abdullah bin Yazid Al-Ansari that he went out with Al-Bara' bin 'Azib, and Zaid bin Arqam and invoked for rain. He ('Abdullah bin Yazid) stood up but not on a pulpit and invoked Allah for rain and then offered two Rak'a prayers with loud recitation without pronouncing Adhan or Iqama. Abu Ishaq said that 'Adbullah bin Yazid had seen the Prophet (ﷺ) (doing the same)
Reference: Sahih al-Bukhari 1022
In-book reference: Book 15, Hadith 17
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 17, Hadith 134