Sahih Muslim Book 7, Hadith Number 2949.

Chapter : Returning from ‘Arafat to Muzdalifa and excellence of observing sunset and ‘Isha prayers together at Muzdalifa.

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.”