(1) باب رَفْعِ الْيَدَيْنِ بِالدُّعَاءِ فِي الاِسْتِسْقَاءِ
Anas reported:
I saw the Messenger of Allah (ﷺ) raising his hands (high enough) in supplication (for rain) that the whiteness of his armpits became visible.
Reference: Sahih Muslim 895 a
In-book reference: Book 9, Hadith 5
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1951