Al-Lu'lu Wal-Marjan 300 — The Book of Mosques and Places of Worship.

Abu Hurairah Narrated from:

Allâh’s Messenger صلى الله عليه وسلم said, “I have been sent with the shortest expressions bearing the widest meanings, and I have been made victorious with terror (cast in the hearts of the enemy), and while I was sleeping, the keys of the treasures of the world were brought to me and put in my hand.” Abû Huraira added: Allâh’s Messenger صلى الله عليه وسلم has left the world, and now, you people are bringing out those treasures (i.e. the Prophet صلى الله عليه وسلم did not benefit by them). ( Sahîh Al-Bukhâri, Hadîth No. 220, Vol. 4)