The Book of Pilgrimage
15/47. Chapter:
Departing from 'Arafat to Al-Muzdalifah. It is recommended to pray Maghrib and 'Isha together in Al-Muzdalifah on this night
Sahih Muslim
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 .
Ibn Umar (Allah be pleased with them) reported that Allah's Messenger (ﷺ) observed the sunset and 'Isha' prayers together at Muzdalifa.
Reference : Sahih Muslim 703eIn-book reference : Book 15, Hadith 314USC-MSA web (English) reference : Book 7, Hadith 2951