Mukhtasar Bukhari (Abridged) 946 — Book of Fasting

Narrated Abu Darda (may Allah be pleased with him): We set out on a journey with the Prophet (peace and blessings of Allah be upon him) during the summer season. The heat was so intense that a person would place his hand on his head due to the severe heat, and none of us was fasting except the Prophet (peace and blessings of Allah be upon him) and Abdullah ibn Rawaha (may Allah be pleased with him).