Chapter 63: Merits of the Helpers in Madinah (Ansaar)
Narrated 'Amr bin Dinar and 'Ubaidullah bin Abi Yazid: In the lifetime of the Prophet (ﷺ) there was no wall around the Ka 'ba and the people used to pray around
the Ka 'ba till 'Umar became the Caliph and he built the wall around it. 'Ubaidullah further said, "Its
wall was low, so Ibn Az-Zubair built it."
Sahih al-Bukhari 3830