Bulugh al-Maram #527
The Book of Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَلِأَبِي نُعَيْمٍ فِي
"مُسْتَخْرَجِ مُسْلِمٍ": { كَانَ إِذَا كَانَ فِي سَفَرٍ, فَزَالَتْ اَلشَّمْسُ صَلَّى اَلظُّهْرَ وَالْعَصْرَ جَمِيعًا, ثُمَّ اِرْتَحَلَ }
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."
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About Bulugh al-Maram
This hadith is #527 from Bulugh al-Maram, in the Book of The Book of Prayer.