Sahih Al Bukhari Hadith Number 1546

Narrated Anas bin Malik: The Prophet (peace be upon him) offered four rak`at in Medina and then two rak`at at Dhul Hulaifa and then passed the night at Dhul-Hulaifa till it was morning and when he mounted his Mount and it stood up, he started to recite Talbiya.

25  Hajj (Pilgrimage)
Hadith number 1546
Volume no 2
Chapter: 24 (Passing the night in Dhul-Hulaifa till dawn)