Musnad Ahmad 27:1680

Ya'qub narrated to us, my brother's son of Ibn Shihab narrated to me, from his paternal uncle Muhammad ibn Muslim, Salim ibn Abdullah informed me, from Abdullah ibn Umar, who said: "The Miqat (appointed place for Ihram) for the people of Medina is Dhu al-Hulayfah, and the Miqat for the people of Ash-Sham is Mahya'ah—and it is Al-Juhfah—and the Miqat for the people of Najd is Qarn." Salim said: I heard Abdullah say: I heard these words from the Messenger of Allah, may Allah bless him and grant him peace.