The Book of Marriage (Kitab Al-Nikah)
Muslim :: Book 8 : Hadith 3246
Jabir b. 'Abdullah and Salama b. al-Akwa' said: There came to us the proclaimer of Allah's Messenger (may peace be upon him) and said: Allah's Messenger (may peace be upon him) has granted you permission to benefit yourselves, i. e. to contract temporary marriage with women.