Musannaf Ibn Abi Shayba 35:61

Waki’ narrated to us, from Sufyan, from Abu al-Zubayr, from Abu al-Tufayl, from Mu’adh ibn Jabal: That the Prophet, peace and blessings of Allah be upon him, combined the Dhuhr and ‘Asr prayers, and the Maghrib and ‘Isha prayers, while traveling during the expedition of Tabuk.