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. (Using translation from Muslim 706a)
«خَرَجْنَا مَعَ النَّبِيِّ ﷺ فِي غَزْوَةِ تَبُوكٍ وَكَانَ يُصَلِّي الظُّهْرَ وَالْعَصْرَ جَمِيعًا وَالْمَغْرِبَ وَالْعِشَاءَ جَمِيعًا»