كتاب الفضائل
43  
The Book of Virtues
(23)
Chapter: The Prophet (SAW) Sweated When It Was Cold, And When The Revelation Came To Him
(23)
باب عَرَقِ النَّبِيِّ صلى الله عليه وسلم فِي الْبَرْدِ وَحِينَ يَأْتِيهِ الْوَحْىُ ‏.‏
Sahih Muslim 2335

'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.

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ، حَدَّثَنَا أَبِي، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ حِطَّانَ بْنِ عَبْدِ اللَّهِ الرَّقَاشِيِّ، عَنْ عُبَادَةَ بْنِ الصَّامِتِ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا أُنْزِلَ عَلَيْهِ الْوَحْىُ نَكَسَ رَأْسَهُ وَنَكَسَ أَصْحَابُهُ رُءُوسَهُمْ فَلَمَّا أُتْلِيَ عَنْهُ رَفَعَ رَأْسَهُ ‏.‏
Reference : Sahih Muslim 2335
In-book reference : Book 43, Hadith 119
USC-MSA web (English) reference : Book 30, Hadith 5767
  (deprecated numbering scheme)