Sahih Muslim 3110
صحيح مسلم#3110SahihIbn Umar (Allah be pleased with them) reported that Allah's Messenger (ﷺ) observed the sunset and 'Isha' prayers together at Muzdalifa
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 15:314