Sahih Muslim Book 7, Hadith Number 2886.

Chapter : Excellence of entry into Mecca from the upper side and exit from it from the lower side, and entering the town from the side other than that from which one gets out.

Ibn ‘Umar reported that Allah’s Messenger (may peace be upon him) used to come out (of Medina) by way of al-Shajarah and entered it by the way of al-Mu’arras and whenever he entered Mecca, he entered it from the upper side and went out of it from the lower side. This Hadith has been narrated on the authority of ‘Ubaidullah with the same chain of transmitters and in the narration transmitted by Zubair (it is mentioned) that the upper side is that which is at al-Batha