It was narrated from Salim, from his father, that the Prophet (ﷺ) joined them (Maghrib and 'Isha') in Al-Muzdalifah, and he prayed each of them with an Iqamah, and he did not offer any voluntary prayer before or after either of them. (ID)
English reference (ID): Vol. 1, Book 7, Hadith 661 (ID)
Arabic reference (ID): Book 7, Hadith 667 (ID)