Musnad Abu Ya'la al-Mawsili 115:110

Ubayd Allah ibn Umar ibn Maysarah narrated to us, Harami ibn Umarah narrated to us, Shu'bah narrated to us, from Qatadah, from Anas, who said: 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."