CHAPTER: Speaking While The Imam Delivers The Khutbah.
Abu Hurairah reported the Messenger of Allah صلی اللہ علیہ وسلم as saying: When you tell (your brother on Friday) to be silent while the imam is giving the sermon you are guilty of idle talk.
Narrated Abdullah ibn Amr ibn al-As: The Prophet صلی اللہ علیہ وسلم said: Three types of people attend Friday prayer; One is present in a frivolous way and that is all he gets from it; another comes with a supplication, Allah may grant or refuse his request as He wishes; another is present silently and quietly with-out stepping over a Muslim or annoying anyone, and that is an atonement for his sins till the next Friday and three days more, the reason being that Allah, the Exalted, says: He who does a good deed will have ten times as much (vi. 160).