Abu Ash-Sha‘thā' reported: As we were sitting in the mosque with Abu Hurayrah (may Allah be pleased with him) the Muezzin proclaimed the Adhān and then a man stood up in the mosque and started walking out. Abu Hurayrah followed him with his eyes until he went out of the mosque. Thereupon, Abu Hurayrah said: "As for this man, he has disobeyed the Prophet (may Allah’s peace and blessings be upon him)." Authentic hadith - Narrated by Muslim