Narrated Salim's father:

The Prophet used to offer the Maghrib and Isha' prayers together whenever he was in a hurry on a journey. Narrated Ibn Abbas: Allah's Apostle used to offer the Zuhr and 'Asr prayers together on journeys, and also used to offer the Maghrib and 'Isha' prayers together. Narrated Anas bin Malik: The Prophet used to offer the Maghrib and the 'Isha' prayers together on journeys.

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ سَمِعْتُ الزُّهْرِيَّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ كَانَ النَّبِيُّ ﷺ يَجْمَعُ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ إِذَا جَدَّ بِهِ السَّيْرُ.