Yahya related to me from Malik from Abu'z Zinad from al-Araj from Abu Hurayra that the Messenger of Allah ﷺ said, "Even saying to your companion 'Listen' while the imam is giving the khutba on the day of jumua, is to speak foolishly."  

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

Yahya related to me from Malik from Ibn Shihab that Thalaba ibn Abi Malik al Quradhi informed him that in the time of Umar ibn al Khattab they used to pray on the day of jumua until Umar came out, and when Umar came out and sat on the mimbar and the muadhdhins called the adhan, they would sit and talk, and then when the muadhdhins were silent and Umar stood to give the khutba, they would pay attention and no-one would speak . Ibn Shihab said, "The imam coming out stops prayer and his speaking stops conversation."  

أَنَّهُ أَخْبَرَهُ أَنَّهُمْ كَانُوا فِي زَمَانِ عُمَرَ بْنِ الْخَطَّابِ يُصَلُّونَ يَوْمَ الْجُمُعَةِ حَتَّى يَخْرُجَ عُمَرُ فَإِذَا خَرَجَ عُمَرُ وَجَلَسَ عَلَى الْمِنْبَرِ وَأَذَّنَ الْمُؤَذِّنُونَ قَالَ ثَعْلَبَةُ جَلَسْنَا نَتَحَدَّثُ فَإِذَا سَكَتَ الْمُؤَذِّنُونَ وَقَامَ عُمَرُ يَخْطُبُ أَنْصَتْنَا فَلَمْ يَتَكَلَّمْ مِنَّا أَحَدٌ قَالَ ابْنُ شِهَابٍ فَخُرُوجُ الإِمَامِ يَقْطَعُ الصَّلاَةَ وَكَلاَمُهُ يَقْطَعُ الْكَلاَمَ  

Yahya related to me from Malik from Abu'n Nadr, the mawla of Umar ibn Ubaydullah, from Malik ibn Abi Amir that Uthman ibn Affan used to say in khutbas, and he would seldom omit it if he was giving the khutba, "When the imam stands delivering the khutba on the day of jumua, listen and pay attention, for there is the same portion for someone who pays attention but cannot hear as for someone who pays attention and hears. And when the iqama of the prayer is called, straighten your rows and make your shoulders adjacent to each other, because the straightening of the rows is part of the completion of the prayer." Then he would not say the takbir until some men who had been entrusted with straightening the rows came and told him that they were straight. Then he would say the takbir.  

أَنَّ عُثْمَانَ بْنَ عَفَّانَ كَانَ يَقُولُ فِي خُطْبَتِهِ قَلَّمَا يَدَعُ ذَلِكَ إِذَا خَطَبَ إِذَا قَامَ الإِمَامُ يَخْطُبُ يَوْمَ الْجُمُعَةِ فَاسْتَمِعُوا وَأَنْصِتُوا فَإِنَّ لِلْمُنْصِتِ الَّذِي لاَ يَسْمَعُ مِنَ الْحَظِّ مِثْلَ مَا لِلْمُنْصِتِ السَّامِعِ فَإِذَا قَامَتِ الصَّلاَةُ فَاعْدِلُوا الصُّفُوفَ وَحَاذُوا بِالْمَنَاكِبِ فَإِنَّ اعْتِدَالَ الصُّفُوفِ مِنْ تَمَامِ الصَّلاَةِ ثُمَّ لاَ يُكَبِّرُ حَتَّى يَأْتِيَهُ رِجَالٌ قَدْ وَكَّلَهُمْ بِتَسْوِيَةِ الصُّفُوفِ فَيُخْبِرُونَهُ أَنْ قَدِ اسْتَوَتْ فَيُكَبِّرُ  

Yahya related to me from Malik from Nafi that Abdullah ibn Umar saw two men talking while the imam was giving the khutba on the day of jumua and he threw pebbles at them to tell them to be quiet.  

أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ رَأَى رَجُلَيْنِ يَتَحَدَّثَانِ وَالإِمَامُ يَخْطُبُ يَوْمَ الْجُمُعَةِ فَحَصَبَهُمَا أَنِ اصْمُتَا  

Yahya related to me from Malik that he had heard that a man sneezed on the day of jumua while the imam was giving the khutba, and a man by his side asked Allah to bless him. Said ibn al Musayyab was asked about it and he forbade the man to do what he had done and said, "Don't do it again."  

أَنَّ رَجُلاً عَطَسَ يَوْمَ الْجُمُعَةِ وَالإِمَامُ يَخْطُبُ فَشَمَّتَهُ إِنْسَانٌ إِلَى جَنْبِهِ فَسَأَلَ عَنْ ذَلِكَ سَعِيدَ بْنَ الْمُسَيَّبِ فَنَهَاهُ عَنْ ذَلِكَ وَقَالَ لاَ تَعُدْ