Musnad Abu Ya'la al-Mawsili 116:53

Ahmad narrated to us, Abu Dawud narrated to us, Shu'bah narrated to us, from Qatadah, who said: I heard Anas saying: The Messenger of Allah (may Allah bless him and grant him peace) said: "If the son of Adam had a valley of wealth, he would seek a second one to go with it, and if he had a second, he would seek a third to go with it. And nothing fills the belly of the son of Adam except dust, and Allah turns in forgiveness to whoever repents." Anas said: I do not know if it was something revealed to him or a statement he used to say.