Silsilah as-Sahihah 520 — Prayer is whispering to Allah; how loud

It is narrated from Sayyiduna Abu Hurairah and Sayyidah Aisha (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) looked into a house and saw that people were praying and reciting aloud. He (peace and blessings be upon him) said to them: "Indeed, the one who is praying is whispering to his Lord, so he should pay attention to Whom he is whispering; therefore, (in prayer) when reciting the Noble Qur'an, you should not raise your voices over one another."