Sahih Muslim Book 006, Hadith Number 2458.

Chapter : Sexual Intercourse is completely forbidden during the day in the month of Ramadhan.

A Hadith like this has been narrated on the authority of Muhammad b. Muslim al-Zuhri with the same chain of transmitters, and he said: There was brought an 'araq containing dates, an 'araq being a huge basket. But in this Hadith no mention has been made of (the fact) that the Apostle of Allah (may peace be upon him) laughed till his molar teeth became visible.

Related Hadith(s)