Musnad Ahmad 32:860

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Qatadah narrating from Anas ibn Malik, he said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying—and I do not know if it was something revealed or if he was saying it—: "If the son of Adam had two valleys of wealth, he would wish—or he would seek—a third valley. And nothing fills the belly of the son of Adam except dust. And Allah accepts the repentance of whoever repents."