Abdullah bin Malik (may Allah have mercy on him) says that I performed three rak'ahs of Maghrib and two rak'ahs of Isha with Sayyiduna Ibn Umar (may Allah be pleased with them both) at Muzdalifah with a single iqamah. Upon this, Malik bin Khalid asked: O Abu Abdur Rahman! What kind of prayer is this? He replied: I have performed these prayers at this place with a single iqamah with the Prophet (peace and blessings of Allah be upon him).
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4893