Musnad Ahmad 30:2982

Yahya narrated to us, from Muhammad ibn ‘Amr, from Abu Salamah, from Ibrahim ibn ‘Abdullah ibn Qariz, from Abu Hurayrah—if Allah wills—from the Prophet, peace and blessings of Allah be upon him, who 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."