Sahih Muslim Book 7, Hadith Number 2663.

Chapter : The place where the pilgrims enter upon the state of Ihram.

Salim b. ‘Abdullah b. ‘Umar b. al-Khattab (Allah be pleased with them) reported his father as saying: I heard the Messenger of Allah (may peace be upon him) as saying that the people of Medina should enter upon the state of Ihram at Dhu’l-Hulaifa, the people of Syria at Mahya’a and that is Juhfa, and the people of Najd at Qarn (al-Manazil). ‘Abdullah b. ‘Umar (Allah be pleased with them) said: (I did not hear it myself from him) but heard from them saying that the Messenger of Allah (may peace be upon him) had (also) said: The people of Yemen should enter upon the state of Ihram at Yalamlam.