(40) باب الرُّخْصَةِ فِي الْمَطَرِ وَالْعِلَّةِ أَنْ يُصَلِّيَ فِي رَحْلِهِ
Narrated Nafi`:
Once on a very cold and stormy night, Ibn `Umar pronounced the Adhan for the prayer and then said, "Pray in your homes." He (Ibn `Umar) added. "On very cold and rainy nights Allah's Messenger (ﷺ) used to order the Mu'adh-dhin to say, 'Pray in your homes.' "
Reference: Sahih al-Bukhari 666
In-book reference: Book 10, Hadith 60
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 635