Musnad Abu Ya'la al-Mawsili 3:8

Zuhayr narrated to us, Abu Mu'awiyah narrated to us, Abd al-Rahman narrated to us, from al-Nu'man ibn Sa'd, from Ali, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, in Paradise there is a market in which there is no buying or selling, except for the forms of men and women. So if a man desires a form, he enters it." He said: "And in it is a gathering place for the wide-eyed houris (al-hur al-'ayn). They will raise their voices with a sound the likes of which the created beings have never heard. They will say: 'We are the eternal ones, so we shall never perish; we are the blissful ones, so we shall never suffer; and we are the pleased ones, so we shall never be displeased. So glad tidings to those who are for us, and for whom we are.'"