Sahih Muslim Book 007, Hadith Number 2662.
Chapter : The place where the pilgrims enter upon the state of Ihram.
Salim reported on the authority of his father ('Abdullah b. 'Umar) that the Messenger of Allah (may peace be upon him) said: The people of Medina should enter upon the state of Ihram at Dhu'l-Hulaifa; the people of Syria at Juhfa, the people of Najd at Qarn (al-Manazil). Ibn 'Umar (Allah be pleased with them) said: It was mentioned to me but I did not myself bear it (directly) from the Messenger of Allah (may peace be upon him) having said this: The people of Yemen should enter upon the state of Ihram at Yalamlam.