Musnad Ahmad 32:1053

Bahz and ‘Affan narrated to us, they said: Aban ibn Yazid narrated to us, Qatadah narrated to us, Anas ibn Malik narrated to us, that the Prophet of Allah, may Allah bless him and grant him peace, used to say: "If the son of Adam had two valleys of wealth, he would surely seek a third valley, and nothing fills the belly of the son of Adam except dust." ‘Affan said: "Then Allah turns in forgiveness to whoever repents."