It is narrated from Sayyiduna Umm Uthman (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) called for Shaybah and opened the door of the Ka'bah, entered the House of Allah, and when he finished and left, Shaybah also went back. In the meantime, a messenger of the Prophet (peace and blessings of Allah be upon him) came again to call Shaybah. When he presented himself again, the Prophet (peace and blessings of Allah be upon him) said: I saw a horn in the House of Allah; 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 those who are praying.