Sayyiduna Ibn Umar (may Allah be pleased with them both) performed the Maghrib and Isha prayers (at Muzdalifah) with a single iqamah and said that at this place, the Prophet (peace and blessings of Allah be upon him) did the same with us.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5241
Hadith Gradingحکم دارالسلام:إسناده صحيح ، م : 1288 .