“If you say to your companions: ‘Be quiet’ on a Friday while the Imam is delivering the sermon, you have engaged in Laghw (idle talk or behaviour).”  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا قُلْتَ لِصَاحِبِكَ أَنْصِتْ يَوْمَ الْجُمُعَةِ وَالإِمَامُ يَخْطُبُ فَقَدْ لَغَوْتَ  

“The Messenger of Allah ﷺ recited Tabarak [Al-Mulk (67)] one Friday, while he was standing and reminding us of the Days of Allah (i.e., preaching to us). Abu Darda’ or Abu Dharr raised an eyebrow at me and said: ‘When was this Surah revealed? For I have not heard it before now.’ He (Ubayy) gestured to him that he should remain silent. When they finished, he said: ‘I asked you when this Surah was revealed and you did not answer me.” Ubayy said: ‘You have gained nothing from your prayer today except the idle talk that you engaged in.’ He went to the Prophet ﷺ and told him about that, and what Ubayy had said to him. The Messenger of Allah ﷺ said: ‘Ubayy spoke the truth.’”  

أَنَّ رَسُولَ اللَّهِ ﷺ قَرَأَ يَوْمَ الْجُمُعَةِ تَبَارَكَ وَهُوَ قَائِمٌ فَذَكَّرَنَا بِأَيَّامِ اللَّهِ وَأَبُو الدَّرْدَاءِ أَوْ أَبُو ذَرٍّ يَغْمِزُنِي فَقَالَ مَتَى أُنْزِلَتْ هَذِهِ السُّورَةُ إِنِّي لَمْ أَسْمَعْهَا إِلاَّ الآنَ فَأَشَارَ إِلَيْهِ أَنِ اسْكُتْ فَلَمَّا انْصَرَفُوا قَالَ سَأَلْتُكَ مَتَى أُنْزِلَتْ هَذِهِ السُّورَةُ فَلَمْ تُخْبِرْنِي؟ فَقَالَ أُبَىٌّ لَيْسَ لَكَ مِنْ صَلاَتِكَ الْيَوْمَ إِلاَّ مَا لَغَوْتَ فَذَهَبَ إِلَى رَسُولِ اللَّهِ ﷺ فَذَكَرَ ذَلِكَ لَهُ وَأَخْبَرَهُ بِالَّذِي قَالَ أُبَىٌّ فَقَالَ رَسُولُ اللَّهِ ﷺ صَدَقَ أُبَىٌّ