Musnad Abu Ya'la al-Mawsili 115:222

Zuhayr narrated to us, al-Hasan ibn Musa narrated to us, Shayban narrated to us, from Qatadah, from Anas: I heard the Messenger of Allah (may Allah bless him and grant him peace) saying: "If the son of Adam had two valleys of wealth, he would seek a third valley. And nothing fills the belly of the son of Adam except dust, and Allah turns in forgiveness to whoever repents."