وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ عَنْ عَلِيِّ بْنِ حُسَيْنٍ، أَنَّهُ كَانَ يَقُولُ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا أَرَادَ أَنْ يَسِيرَ يَوْمَهُ جَمَعَ بَيْنَ الظُّهْرِ وَالْعَصْرِ وَإِذَا أَرَادَ أَنْ يَسِيرَ لَيْلَهُ جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ ‏.‏

Yahya related to me from Malik that he had heard that AIi ibnHusain used to say, "The Messenger of Allah, may Allah bless him andgrant him peace, would join dhuhr and asr if he wished to travel thesame day, and he would join maghrib and isha if he wished to travelthe same night." Translation Not Available

Book Ref: Muwatta Imam Malik Book 9 Hadith 335
Web Ref:  Muwatta Imam Malik Book 9 Hadith 7