صَحِيحُ مُسْلِمٍ
Sahih Muslim 1288 c
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
وَحَدَّثَنِيهِ زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا شُعْبَةُ، بِهَذَا الإِسْنَادِ وَقَالَ صَلاَّهُمَا بِإِقَامَةٍ وَاحِدَةٍ .
Shu'ba reported this hadith with the same chain of transmitters and said: He (the Prophet) observed the two prayers (together) with one iqama.
Sahih Muslim, 1288 cSahihصحيح