We set out with the Messenger of Allah ﷺ on the Tabuk expedition, and he observed the noon and afternoon prayers together and the sunset and 'Isha' prayers together.
خَرَجْنَا مَعَ رَسُولِ اللَّهِ ﷺ فِي غَزْوَةِ تَبُوكَ فَكَانَ يُصَلِّي الظُّهْرَ وَالْعَصْرَ جَمِيعًا وَالْمَغْرِبَ وَالْعِشَاءَ جَمِيعًا