Sahih al-Bukhari 3258

Abu al-Walid narrated to us: Shuʿba narrated to us, from Muhajir Abu al-Hasan, who said: I heard Zayd ibn Wahb say: I heard Abu Dharr (may Allah be pleased with him) say: The Prophet (ﷺ) was on a journey and said, ‘Wait until it cools.’ Then he said, ‘Wait until it cools,’ until the shade had lengthened over the hillocks. Then he said, ‘Delay the prayer until it cools, for the intensity of heat is from the breath of Hell.’