كتاب الحج
15  
The Book of Pilgrimage
(47)
Chapter: Departing from 'Arafat to Al-Muzdalifah. It is recommended to pray Maghrib and 'Isha together in Al-Muzdalifah on this night
(47)
باب الإِفَاضَةِ مِنْ عَرَفَاتٍ إِلَى الْمُزْدَلِفَةِ وَاسْتِحْبَابِ صَلاَتَىِ الْمَغْرِبِ وَالْعِشَاءِ جَمْعًا بِالْمُزْدَلِفَةِ فِي هَذِهِ اللَّيْلَةِ
Sahih Muslim 1286 c

This hadith has been narrated on the authority of 'Urwa with the same chain of transmitters. and in the hadith narrated by Humaid there is an addition (of these words):

" Hisham said: Al-nass (speed of camel) is faster than al-'anaq."
وَحَدَّثَنَاهُ أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، وَعَبْدُ اللَّهِ بْنُ نُمَيْرٍ، وَحُمَيْدُ، بْنُ عَبْدِ الرَّحْمَنِ عَنْ هِشَامِ بْنِ عُرْوَةَ، بِهَذَا الإِسْنَادِ وَزَادَ فِي حَدِيثِ حُمَيْدٍ قَالَ هِشَامٌ وَالنَّصُّ فَوْقَ الْعَنَقِ ‏.‏
Reference : Sahih Muslim 1286c
In-book reference : Book 15, Hadith 312
USC-MSA web (English) reference : Book 7, Hadith 2949
  (deprecated numbering scheme)