Zayd bin Jubayr says: I came to Sayyiduna Ibn Umar (may Allah be pleased with them both) in his tent and asked: From where is it permissible for me to perform Umrah? He said: The Messenger of Allah (peace and blessings be upon him) "appointed Qarn for the people of Najd, Dhu al-Hulayfah for the people of Madinah, and al-Juhfah for the people of Sham."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8910