Abu Hurairah reported the Messenger of Allah (ﷺ) 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
SahihSahihSahihBook 2 · Hadith 723
سنن أبي داود
Abu Hurairah reported the Messenger of Allah (ﷺ) 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