Musannaf Ibn Abi Shayba 8:1416

Abu Bakr narrated to us, he said: Ibn Numayr narrated to us, from al-Hakam, from Sa’id ibn Jubayr, from Ibn ‘Umar, who said: I prayed the Maghrib and the ‘Isha’ with him with a single iqamah. And he said: I did [this] with the Messenger of Allah, may Allah bless him and grant him peace.