"The Messenger of Allah designated Dhul-Hulaifah as the Miqat for the people of Al-Madinah, Al-Juhfah for the people Ash-sham and Egypt, Dhat 'Irq for the people Al-'Iraq, Qarn for the people of Najd and Yalamlam for the people of Yemen."
Sunan an-Nasa'i Book 24, Hadith 38