Musnad Ahmad 30:2827

'Abd al-Rahman narrated to us, he said: Hammad ibn Salamah narrated to us, from Thabit, from Abu Rafi', from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "Whoever enters Paradise shall live in bliss and shall not suffer, his clothes shall not wear out, and his youth shall not fade. Indeed, in Paradise there is what no eye has seen, no ear has heard, and has not occurred to the heart of any human."