Musnad Abu Ya'la al-Mawsili 42:57

Ahmad ibn Ibrahim al-Dawraqi narrated to us, Abu Dawud narrated to us, Imran narrated to us, from Qatadah, from Abdullah ibn Abi Utbah, from Abu Sa’id al-Khudri, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "This House shall surely be performed Hajj to, and it shall surely be performed Umrah to, after the emergence of Gog and Magog."