Musnad Ahmad 30:1437

'Affan narrated to us, Abu 'Awanah narrated to us, Suhayl ibn Abi Salih narrated to us, from his father, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "May his nose be rubbed in the dust, then may his nose be rubbed in the dust, then may his nose be rubbed in the dust: the man who finds his parents, one or both of them, in their old age, and does not enter Paradise."