Saeed bin Jubair (may Allah have mercy on him) says that at the time of departure from Arafat towards Muzdalifah, we were with Sayyiduna Ibn Umar (may Allah be pleased with them both). He led us in the complete Maghrib prayer, then said «الصلوة» and led us in two rak'ahs (of Isha), and said that the Prophet (peace and blessings of Allah be upon him) also did at this place just as I have done.