Musnad Ahmad 30:2879

Ishaq narrated to us, Malik narrated to us, from Abdullah ibn Salman, from his father, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "A prayer in this mosque of mine is better than a thousand prayers in what is other than it, except for the Sacred Mosque (al-Masjid al-Haram)."