Hadith 352

Bulugh al-Maram

Book 2: The Book of Prayer
وَلِأَبِي نُعَيْمٍ فِي : { كَانَ إِذَا كَانَ فِي سَفَرٍ, فَزَالَتْ اَلشَّمْسُ صَلَّى اَلظُّهْرَ وَالْعَصْرَ جَمِيعًا, ثُمَّ اِرْتَحَلَ }
"مُسْتَخْرَجِ مُسْلِمٍ"
Abu Nu'aim has in his Mustakhraj of Muslim, "While on a journey, if the sun declined he (ﷺ) used to pray Zuhr and 'Asr together and then continue his journey."