Sahih Muslim , Book 15, Hadith 314 (In-Book) ⓘ
Ibn Umar (Allah be pleased with them) reported that Allah's Messenger observed the sunset and 'Isha' prayers together at Muzdalifa.
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمِ بْنِ، عَبْدِ اللَّهِ عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم صَلَّى الْمَغْرِبَ وَالْعِشَاءَ بِالْمُزْدَلِفَةِ جَمِيعًا .
also referenced under: Hadith 703 (Reference) & Book 7, Hadith 2951 (USC-MSA)