Musnad Ahmad 32:288

Yazid narrated to us, Shu'bah informed us, from Qatadah, from Anas, who said: I used to hear the Messenger of Allah (may Allah bless him and grant him peace) saying—and I do not know if it was something revealed to him or something he was saying, and he was saying—: "If the son of Adam had two valleys of wealth, he would seek a third for them. And nothing fills the belly of the son of Adam except dust, and Allah accepts the repentance of whoever repents."