Sahih Bukhari Volume 2, Book 26, Hadith Number 670.

Narated By Isma’li bin Abu Khalid : ‘Abdullah bin Abu Aufa said, “Allah’s Apostle performed the ‘Umra. He performed Tawaf of the Ka’ba and offered two Rakat behind the Maqam (Abraham’s place) and was accompanied by those who were screening him from the people.” Somebody asked ‘Abdullah, “Did Allah’s Apostle enter the Ka’ba?” ‘Abdullah replied in the negative.