كتاب قصر الصلاة فى السفر
9  
Shortening the Prayer

Yahya related to me from Malik that he had heard that AIi ibn Husain used to say, "The Messenger of Allah, may Allah bless him and grant him peace, would join dhuhr and asr if he wished to travel the same day, and he would join maghrib and isha if he wished to travel the same night."

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 ‏.‏
USC-MSA web (English) reference : Book 9, Hadith 7
Arabic reference : Book 9, Hadith 335