Saeed bin Jubair (may Allah have mercy on him) offered Maghrib and Isha prayers at Muzdalifah with a single Iqamah, and he narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he also did the same, and he informed that the Prophet (peace and blessings of Allah be upon him) also did the same.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5290
Hadith Gradingحکم دارالسلام:إسناده صحيح ، م : 1288 .