صَحِيحُ مُسْلِمٍ
Sahih Muslim 703 e
The Book of Pilgrimage
Departing from 'Arafat to Al-Muzdalifah. It is recommended to pray Maghrib and 'Isha together in Al-Muzdalifah on this night
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.
Sahih Muslim, 703 eSahihصحيح