The Book of Pilgrimage (Kitab Al-Hajj)
Muslim :: Book 7 : Hadith 2666
Abu Zubair heard Jabir b. 'Abdullah (Allah be pleased with them) as saying as he was asked about (the place for entering upon the) state of Ihram: I heard (and I think he carried it directly to the Apostle of Allah) him saying: For the people of Medina Dhu'l-Hulaifa is the place for entering upon the state of Ihram, and for (the people coming through the other way, i. e. Syria) it is Juhfa; for the people of Iraq it is Dbat al-'Irq; for the people uf Najd it is Qarn (al-Manazil) and for the people of Yemen it is Yalamlam.