The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj)
Dawud :: Book 10 : Hadith 1870
Narrated Aisha, Ummul Mu'minin:
Ibn Umar was informed about the statement of Aisha that a part of al-Hijr is included in the magnitude of the Ka'bah. Ibn Umar said: By Allah, I think that she must have heard it from the Apostle of Allah (peace_be_upon_him). I think that the Apostle of Allah (peace_be_upon_him) had not given up touching both of them but for the reason that they were not on the foundation of the House (the Ka'bah), nor did the people circumambulate (the House) beyond al-Hijr for this reason.