"Words were exchanged between two clans of the Ansar, to the point that they began to throw rocks at one another. The Prophet ) turned to the people and said: 'If you noticed something while you were praying, why did you clap? That is for women. Whoever notices something while he is praying, let him say: "Subhan Allah."
Sunan an-Nasa'i Book 49, Hadith 35