Salim bin Abdullah (may Allah have mercy on him) narrates from his father (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) combined Maghrib and Isha at Muzdalifah, and did not give the adhan for either of them, only the iqamah; he did not pray any voluntary prayer between them, nor anything after them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1878