[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