Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) combined Zuhr and Asr, and Maghrib and Isha, in the year of Tabuk.
Only Uthman bin Umar narrated it in this way; others narrated it from al-Thawri, from Abu al-Zubayr, from Abu al-Tufayl.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5524