(21) باب رَفْعِ النَّاسِ أَيْدِيَهُمْ مَعَ الإِمَامِ فِي الاِسْتِسْقَاءِ
Narrated Anas bin Malik:
A bedouin came to Allah's Messenger (ﷺ) on a Friday and said, "O Allah's Messenger ! The livestock, the offspring, and the people have perished." So, Allah's Messenger (ﷺ) raised both his hands invoking Allah (for rain) and the people too raised their hands with Allah's Messenger (ﷺ) invoking Allah (for rain). We had not left the mosque when it started raining. It rained till the next Friday when the same man came to Allah's Messenger (ﷺ) and said, "O Allah's Messenger! The travelers are compelled to postpone their journeys (because of excessive rain) and the roads are overflowed."
Reference: Sahih al-Bukhari 1029
In-book reference: Book 15, Hadith 24
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 17, Hadith 140