[Machine] The Messenger of Allah ﷺ used to deliver two sermons on Fridays, with a sitting session in between them.  

كَانَ رَسُولُ اللهِ ﷺ يَخْطُبُ يَوْمَ الْجُمُعَةِ خُطْبَتَيْنِ بَيْنَهُمَا جِلْسَةٌ  

[Machine] The first Friday prayer was held in Medina before the arrival of the Messenger of Allah ﷺ , and it was led by Mus'ab ibn Umayr with the Muslims. It has been conveyed to us that there is no Friday prayer without a sermon. So, whoever does not deliver a sermon should pray four units (rak'ahs).  

أَنَّ أَوَّلَ مَا جُمِّعَتِ الْجُمُعَةُ بِالْمَدِينَةِ قَبْلَ أَنْ يَقْدُمَهَا رَسُولُ اللهِ ﷺ فَجَمَّعَ بِالْمُسْلِمِينَ مُصْعَبُ بْنُ عُمَيْرٍ قَالَ وَبَلَغَنَا أَنَّهُ لَا جُمُعَةَ إِلَّا بِخُطْبَةٍ فَمَنْ لَمْ يَخْطُبْ صَلَّى أَرْبَعًا  

[Machine] If the imam does not give a sermon on Friday, then he prays four units (rak'ahs) and we have been informed about that from Ata ibn Abi Rabah and others, and from Saeed ibn Jubair who said: "Friday used to be four (rak'ahs) but the sermon was made in place of the two units of prayer."  

إِذَا لَمْ يَخْطُبِ الْإِمَامُ يَوْمَ الْجُمُعَةِ صَلَّى أَرْبَعًا وَرُوِّينَا ذَلِكَ عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ وَغَيْرِهِ وَعَنْ سَعِيدِ بْنِ جُبَيْرٍ قَالَ كَانَتِ الْجُمُعَةُ أَرْبَعًا فَجُعِلَتِ الْخُطْبَةُ مَكَانَ الرَّكْعَتَيْنِ