'Ubadah bin Samit reported that when wahi (inspiration) descended upon Allah's Messenger (ﷺ) , he felt a burden on that account and the colour of his face underwent a change.
Hadith Referenceصحيح مسلم / كتاب الفضائل / 2334
Hadith Gradingمحدثین:أحاديث صحيح مسلم كلها صحيحة
Hadith Takhrij«أحاديث صحيح مسلم كلها صحيحة»
Explanation & Benefits
Shaykh Maulana Abdul Aziz Alvi
Hadith Commentary: Vocabulary of the Hadith: (1) yafsim: To stop, to be closed, or for a state to be lifted. (2) kurb: To feel distress and suffering. (3) tarabbad: To become changed, to become darkish, that is, due to the intensity of revelation, the color of the face would become pale, because due to the descent of a "weighty word" (qawl thaqil), the Prophet (sallallahu alayhi wa sallam) would pass through hardship and difficulty.
Source: Tuhfat al-Muslim: Commentary on Sahih Muslim, Page: 6060