Musannaf Ibn Abi Shayba 34:200

Abu Mu'awiyah narrated to us, from al-A'mash, from Ibrahim al-Taymi, from his father, from Abu Dharr, who said: I said, "O Messenger of Allah, which mosque was placed on the earth first?" He said, "The Sacred Mosque (al-Masjid al-Haram)." I said, "Then which?" He said, "The Furthest Mosque (al-Masjid al-Aqsa)," meaning Bayt al-Maqdis.