Sahih Muslim Book 7, Hadith Number 3136.

Chapter : The Muhajir is permitted to stay for three days in Mecca after Hajj and Umra and not more than this.

Al-‘Ala’ b. al-Hadrami reported Allah’s Messenger (may peace be upon him) as saying: It is only for three nights that a Muhajir should stay at Mecca after the completion of the rituals of Hajj.