I saw the Messenger of Allah ﷺ combining the sunset and Isha' prayers when he was in a hurry on a journey. (Using translation from Muslim 703c)
عَنْ سَالِمٍعَنْ أَبِيهِ رَأَيْتُ رَسُولَ اللهِ ﷺ يَجْمَعُ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ إِذَا جَدَّ بِهِ السَّيْرُ