It is narrated from Abdullah bin Umar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The people of Madinah should assume ihram from Dhu'l-Hulaifah, the people of Shaam from Juhfah, and the people of Najd from Qarn (al-Manazil)." Ibn Umar (may Allah be pleased with him) said: They (the Companions, may Allah be pleased with them) understood that the Messenger of Allah (peace and blessings be upon him) said: "And the people of Yemen should assume ihram from Yalamlam."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 760
Hadith Takhrijاخرجه البخاري، الحج، باب مهل اهل نجد (1527) ، (1528) ومسلم، الحج، باب مواقيت الحج (1182)۔