Sahih Muslim , Hadith 2335 ⓘ
'Ubida b. Samit reported that when wahi descended upon Allah's Apostle, 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 .
also referenced under: Book 43, Hadith 119 (In-Book) & Book 30, Hadith 5767 (USC-MSA)