Sahih al-Bukhari, Book 18, Hadith 26 (In-Book) ⓘ
Narrated Salim's father: The Prophet used to offer the Maghrib and `Isha' prayers together whenever he was in a hurry on a journey.
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ سَمِعْتُ الزُّهْرِيَّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يَجْمَعُ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ إِذَا جَدَّ بِهِ السَّيْرُ.
also referenced under: Hadith 1106 (DarusSalam) & Volume 2, Book 20, Hadith 209 (USC-MSA)