Musnad Ahmad 30:2192

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Ibrahim ibn al-Muhajir, from Abu al-Sha‘tha’ al-Muharibi, who said: We were sitting with Abu Hurayrah in the mosque, and the caller to prayer (mu'adhdhin) gave the call. A man stood up in the mosque and went out. Abu Hurayrah said: "As for this one, he has disobeyed Abu al-Qasim, may Allah bless him and grant him peace."