(2) باب الدُّعَاءِ فِي الاِسْتِسْقَاءِ
Anas (b. Malik) reported:
It rained upon us as we were with the Messenger of Allah (ﷺ). The Messenger of Allah (way peace be upon him) removed his cloth (from a part of his body) till the rain fell on it. We said: Messenger of Allah, why did you do this? He said: It is because it (the rainfall) has just come from the Exalted Lord.
Reference: Sahih Muslim 898
In-book reference: Book 9, Hadith 14
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1960