(41) باب هَلْ يُصَلِّي الإِمَامُ بِمَنْ حَضَرَ وَهَلْ يَخْطُبُ يَوْمَ الْجُمُعَةِ فِي الْمَطَرِ
Narrated Abu Sa`id Al-Khudri:
A cloud came and it rained till the roof started leaking and in those days the roof used to be of the branches of date-palms. Iqama was pronounced and I saw Allah's Messenger (ﷺ)s prostrating in water and mud and even I saw the mark of mud on his forehead.
Reference: Sahih al-Bukhari 669
In-book reference: Book 10, Hadith 63
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 638