The Prophet ﷺ prayed Maghrib at Muzdalifa. When we had made our camels kneel down, he said, "The prayer is to be performed with a single iqama."
حدثنا محرز بن سلمة العدني حدثنا عبد العزيز بن محمد عن عبيد الله
أن النبي ﷺ صلى المغرب بالمزدلفة فلما أنخنا قال الصلاة بإقامة
No references are available.
Its chain of transmission is sahih, and it has another route through Salim, found in Bukhari, Hajj, chapter on one who combines them both without performing a voluntary act, hadith no. 1673, and elsewhere.