It is narrated from Hazrat Umm Uthman (may Allah be pleased with her) that the Noble Prophet (peace and blessings be upon him) called Shaibah and opened the door of the Ka'bah and entered the House of Allah. When the Prophet (peace and blessings be upon him) finished and left, Shaibah also went back. In the meantime, a messenger of the Noble Prophet (peace and blessings be upon him) came again to call Shaibah. When he presented himself again, the Noble Prophet (peace and blessings be upon him) said: I saw a horn in the House of Allah; you should remove it from there. And in another narration, there is also this addition: There should not be anything in the House of Allah that distracts the worshippers.