Musnad Ahmad 961:51

Hammad ibn Khalid narrated to us, Hisham ibn Sa’d narrated to us, from Abu al-Zubayr, from Abu al-Tufayl, from Mu’adh ibn Jabal, who said: The Prophet, peace and blessings of Allah be upon him, during the expedition of Tabuk, would not depart until it became cool. He would combine the Dhuhr and ‘Asr prayers, and the Maghrib and ‘Isha prayers.