I saw the Messenger of Allah ﷺ delaying the sunset prayer till he would combine it with the 'Isha' when he hastened to set out on a journey. (Using translation from Muslim 703d)
«رَأَيْتُ رَسُولَ اللهِ ﷺ كَانَ إِذَا أَعْجَلَهُ السَّيْرُ فِي السَّفَرِ يُؤَخِّرُ صَلَاةَ الْمَغْرِبِ حَتَّى يَجْمَعَ بَيْنَهَا وَبَيْنَ صَلَاةِ الْعِشَاءِ»