Musnad Abu Ya'la al-Mawsili 154:19

Bishr ibn al-Walid al-Kindi narrated to us, Sharik narrated to us, from Salamah ibn Kuhayl, from Sa'id ibn Jubayr, from Ibn Umar, that he prayed with them at Jam' (Muzdalifah) with an Adhan and an Iqamah for the Maghrib prayer. Then he said, "The prayer," and he prayed the Isha prayer. It was said to him regarding that, and he said, "This is how I prayed with the Messenger of Allah, peace and blessings of Allah be upon him, in this place."