It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) was observing i'tikaf in the mosque. During this time, he heard people reciting the Holy Qur'an in loud voices. At that moment, the Prophet (peace and blessings be upon him) was in his tent. The Prophet (peace and blessings be upon him) lifted his curtain and said, "Remember! Each of you is supplicating to his Lord, so do not cause trouble to one another and do not raise your voices over each other."