Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 3081
'A'isha (Allah be pleased with her), wife of Allah's Apostle (may peace be upon him), heard Allah's Messenger (may peace be upon him) as saying: If your people, had not been recent converts to Islam, I would have spent the treasure of the Ka'ba in the way of Allah and would have constructed its door just on the level of the ground and would have encompassed in it the space of Hijr.