Sahih Muslim Book 7, Hadith Number 3146.

Chapter : It is permissible to enter Mecca without Ihram.

Jabir b. ‘Abdullah al-Ansari (Allah be pleased with them) reported that Allah’s Messenger (may peace be upon him) entered Mecca and Qutaiba (another narrator) stated that he entered Mecca in the Year of Victory, wearing a black turban, but not wearing the Ihram.