Sahih Muslim
The Book Pertaining to Paradise, Its Description, Its Bounties and Its Intimates (Kitab Al-Jannat wa Sifat Naimiha wa Ahliha)
Book Number: 040 / Hadith Number: 6844
'A'isha reported that she beard Allah's Messenger (may peace be upon him) as saying: The people would be assembled on the Day of Resurrection barefooted, naked and uncircumcised. I said: Allah's Messenger, will the male and the female be together on the Day and would they be looking at one another? Upon this Allah's Messenger (may peace be upon him) said: 'A'isha, the matter would be too serious for them to look to one another.