Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) appointed Dhu al-Hulayfah as the miqat for the people of Madinah, al-Juhfah for the people of Sham, Qarn for the people of Najd, and Yalamlam for the people of Yemen: for them, and for everyone who passes by those places intending Hajj or Umrah. Whoever is nearer than those places should enter ihram from wherever he sets out, so that even the people of Makkah enter ihram from Makkah itself.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10865