Sahih Muslim Book 7, Hadith Number 3121.

Chapter : Staying at Dhu’l-Halaifa and observing of prayer there, while returning from Hajj or Umra.

Nafi’ reported that ‘Abdullah b. Umar (Allah be pleased with them) used to halt his camel in the stony ground at Dhu’l-Hulaifa, where Allah’s Messenger (may peace be upon him) used to make a halt (and pray).