Musnad Ahmad 30:1422

'Affan narrated to us, Hammad ibn Salamah narrated to us, Yunus informed us, from Muhammad ibn Sirin, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "For the man among the people of Paradise are two wives from the wide-eyed houris. Upon each one of them are seventy garments. He sees the marrow of her shin from behind the clothes."