Sahih Bukhari Volume 2, Book 26, Hadith Number 597.

Narated By Zaid bin Jubair : I went to visit ‘Abdullah bin ‘Umar at his house which contained many tents made of cotton cloth and these were encircled with Suradik (part of the tent). I asked him from where, should one assume Ihram for Umra. He said, “Allah’s Apostle had fixed as Miqat (singular of Mawaqit) Qarn for the people of Najd, Dhul-Hulaifa for the people of Medina, and Al-Juhfa for the people of Sham.”