The Messenger of Allah ﷺ prayed Maghrib and Isha together at Muzdalifa.
حدثنا عبد الله بن مسلمة عن مالك عن ابن شهاب عن سالم بن عبد الله
أن رسول الله ﷺ صلى المغرب والعشاء بالمزدلفة جميعا
Muslim narrated it in the Book of Hajj, in the chapter titled "Departing from Arafat to Muzdalifa," etc., no. 703, after no. 1287, from the hadith of Malik through this route, and it is in Muwatta (Yahya's recension): 1/400 (Abu Musab's recension: 372).