Musannaf Ibn Abi Shayba 27:162

Waki’ narrated to us, from Sufyan, from Habib, from Khaythama, who said: It was said to the Prophet, peace and blessings of Allah be upon him: "If you wish, we will give you the keys of the earth and its treasures, and that will not diminish anything for you with us in the Hereafter. And if you wish, we will gather them for you in the Hereafter." He said: "No, rather gather them for me in the Hereafter." Then was revealed: "Blessed is He who, if He willed, could have given you [something] better than that - gardens beneath which rivers flow and could make for you palaces."