Abu Hurairah said: "I heard the Messenger of Allah ﷺ say: 'If you say to your companion: Listen attentively on a Friday when the Imam is delivering the khutbah, then you have engaged in idle talk.'"
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا قُلْتَ لِصَاحِبِكَ أَنْصِتْ يَوْمَ الْجُمُعَةِ وَالإِمَامُ يَخْطُبُ فَقَدْ لَغَوْتَ