(31) باب نَهْىِ رَسُولِ اللَّهِ صلى الله عليه وسلم عَنْ نِكَاحِ الْمُتْعَةِ آخِرًا
Salama bin Al-Akwa` said:
Allah's Messenger (ﷺ)'s said, "If a man and a woman agree (to marry temporarily), their marriage should last for three nights, and if they like to continue, they can do so; and if they want to separate, they can do so." I do not know whether that was only for us or for all the people in general. Abu `Abdullah (Al-Bukhari) said: `Ali made it clear that the Prophet said, "The Mut'a marriage has been cancelled (made unlawful).
Reference: Sahih al-Bukhari 5119
In-book reference: Book 67, Hadith 55
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 62, Hadith 52