Musnad Ahmad 387:1

Ali ibn Ishaq narrated to us, he said: Abdullah informed us, he said: Muhammad ibn Abd al-Rahman informed us, from Mansur ibn Abd al-Rahman, from his mother, from Umm Uthman bint Sufyan—and she is the mother of the elder Banu Shaybah. Muhammad ibn Abd al-Rahman said: She had pledged allegiance to the Prophet, may Allah bless him and grant him peace. The Prophet, may Allah bless him and grant him peace, called for Shaybah, so he opened [the Kaaba]. When he entered the House and returned, and finished and Shaybah returned, the messenger of the Messenger of Allah, may Allah bless him and grant him peace, came saying: "Answer [the call]." So he came to him, and he said: "I saw a horn in the House, so hide it." Mansur said: Abdullah ibn Musafi' narrated to me, from my mother, from Umm Uthman bint Sufyan, that the Prophet, may Allah bless him and grant him peace, said to him in the hadith: "For it is not appropriate that there be in the House anything that distracts those who pray."