(29) Excellent Qualities and Description of the Prophet
كتاب الفضائل والشمائل
(4a) Chapter: The Commission and the Beginning of the Revelation - Section 1
(4) باب المبعث وبدء الوحي - الفصل الأول
Mishkat al-Masabih 5845 
`Ubada b. as-Samit said that when the inspiration descended on the Prophet, he was distressed on account of that and his face was altered to a dark hue. A version says, he lowered his head and his companions lowered their heads; then when it was removed from him, he raised his head. Muslim transmitted it.
وَعَنْ عُبَادَةَ بْنِ الصَّامِتِ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذا نزل عَلَيْهِ الْوَحْيُ كُرِبَ لِذَلِكَ وَتَرَبَّدَ وَجْهُهُ. وَفِي رِوَايَة: نكَّسَ رأسَه ونكَّسَ أصحابُه رؤوسَهم فَلَمَّا أُتْلِيَ عَنْهُ رَفَعَ رَأْسَهُ. رَوَاهُ مُسْلِمٌ
 صَحِيح  (الألباني)حكم :
Reference : Mishkat al-Masabih 5845
In-book reference : Book 29, Hadith 103