Ibn Hibban

Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) set out for the Battle of Tabuk. When he would depart before the sun had declined, he would delay the Zuhr prayer until he combined it with the Asr prayer, and he would perform both prayers together. And when he would depart after the sun had declined, he would perform the Zuhr and Asr prayers together and then set out. When he would depart before Maghrib, he would delay the Maghrib prayer until he performed it along with the Isha prayer. And when he would depart after Maghrib, he would perform the Isha prayer early and combine it with the Maghrib prayer.