(23) باب عَرَقِ النَّبِيِّ صلى الله عليه وسلم فِي الْبَرْدِ وَحِينَ يَأْتِيهِ الْوَحْىُ .
'Ubida b. Samit reported that when wahi descended upon Allah's Apostle (ﷺ), he lowered his head and so lowered his Companions their heads, and when (this state) was over, he raised his head.
Reference: Sahih Muslim 2335
In-book reference: Book 43, Hadith 119
USC-MSA web (English) reference(deprecated numbering scheme): Book 30, Hadith 5767