It was narrated from Abu Hurairah that:

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."

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ عُقَيْلٍ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ ﷺ قَالَ " مَنْ قَالَ لِصَاحِبِهِ يَوْمَ الْجُمُعَةِ وَالإِمَامُ يَخْطُبُ أَنْصِتْ فَقَدْ لَغَا " .