What is the ruling on the congregants saying "Allahu Akbar" (God is Greatest) during the Friday sermon if the khatib (preacher) says something inspiring and then says "Allahu Akbar," and the congregants then follow suit?

Saying takbir (Allahu Akbar) when a Muslim hears something he approves of and that ignites his spiritual enthusiasm is permissible. However, saying takbir while the Imam is delivering the Friday sermon is considered a distraction (laghw), which contradicts the prescribed manner of listening to the preacher. The Prophet, peace and blessings be upon him, said: "If you say to your companion on Friday, 'Listen!' while the Imam is delivering the sermon, you have engaged in laghw (a vain act)." This indicates that any speech that distracts from listening and paying attention is laghw. Such takbir interrupts the Imam's sermon and causes disruption. This method of expressing enthusiasm during the Friday sermon is not known from the Sunnah or the guidance of the Salaf. Rather, the Sunnah dictates that the Friday sermon is a time for silent listening, not for vocalizing dhikr.