The Messenger of Allah ﷺ said: "Whoever says to his companion on Friday, when the imam is delivering the khutbah: 'Listen attentively,' has engaged in idle talk."
عَنِ النَّبِيِّ ﷺ قَالَ مَنْ قَالَ لِصَاحِبِهِ يَوْمَ الْجُمُعَةِ وَالإِمَامُ يَخْطُبُ أَنْصِتْ فَقَدْ لَغَا