(17) باب التَّخْيِيرِ فِي الصَّوْمِ وَالْفِطْرِ فِي السَّفَرِ
Abu Darda' (Allah be pleased with him) reported:
We set out during the month of Ramadan with the Messenger of Allah (ﷺ) in such an intense heat that one of us would place his hand over his head (in order to protect himself) against the excessive heat, and none among us was observing the fast, except the Messenger of Allah (ﷺ) and 'Abdullah b. Rawaha.
Reference: Sahih Muslim 1122 a
In-book reference: Book 13, Hadith 136
USC-MSA web (English) reference(deprecated numbering scheme): Book 6, Hadith 2492