Narrated `Aisha:
The Quraish people and those who embraced their religion, used to stay at Muzdalifa and used to call themselves Al-Hums, while the rest of the Arabs used to stay at `Arafat. When Islam came, Allah ordered His Prophet to go to `Arafat and stay at it, and then pass on from there, and that is what is meant by the Statement of Allah:--"Then depart from the place whence all the people depart......" (2.199)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 45
Arabic reference: Book 65, Hadith 4520