Sahih Muslim Book 7, Hadith Number 3123.

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

Salim (b. Abdullah b. ‘Umar) reported on the authority of his father (Allah be pleased with them) that Allah’s Apostle (may peace be upon him) was visited by (someone, i.e. an angel) during the fag end of the night at Dhu’l-Hulaifa, and it was said to him: Verily it is a blessed stony-ground.