Musnad Ahmad 30:2156

'Affan narrated to us, Hammad narrated to us, he said: Thabit informed us, from Abu Rafi', from Abu Hurairah, from the Prophet (peace and blessings of Allah be upon him) — according to what Hammad reckons — he said: "Indeed, whoever enters Paradise shall live in bliss and shall not suffer; his clothes shall not wear out, and his youth shall not fade. In Paradise, there is what no eye has seen, no ear has heard, and has not occurred to the heart of any human."