Sahih Bukhari Volume 9, Book 87, Hadith Number 127.

Narrated By Abu Huraira : The Prophet said, “I have been given the keys of eloquent speech and given victory with awe (cast into the hearts of the enemy), and while I was sleeping last night, the keys of the treasures of the earth were brought to me till they were put in my hand.” Abu Huraira added: Allah’s Apostle left (this world) and now you people are carrying those treasures from place to place.