Musnad Ahmad 30:363

Yazid narrated to us, Muhammad ibn ‘Amr informed us, he said: I heard Salman Abu ‘Abd Allah al-Agharr, from Abu Hurayrah, 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)."