"The Prophet was delivering a Khutbah on Friday when a man came. The Prophet said: 'Have you prayed?' He said no. So he said: 'Then stand and pray.'" Abu Eisa said: This Hadith is Hasan Sahih [It is the most correct thing about this topic.]  

بَيْنَا النَّبِيُّ ﷺ يَخْطُبُ يَوْمَ الْجُمُعَةِ إِذْ جَاءَ رَجُلٌ فَقَالَ النَّبِيُّ ﷺ أَصَلَّيْتَ قَالَ لاَ قَالَ قُمْ فَارْكَعْ  

"Abu Sa'eed Al-Khudri entered (the mosque) on Friday while Marwan was giving the Khutbah, so he began praying. Two guards came to make him sit down but he refused until he had prayed. When he finished he came to us and we said: 'May Allah have mercy upon you. They nearly harmed you.' He said: 'I was not going to stop performing them (the two Rak'ah) after what I saw from Messenger of Allah.' Then he mentioned that a man who appeared untidy came on Fridy while the Prophet was delivering the Friday Khutbah, so he ordered him to pray two Rak'ah all the while the Prophet was delivering the Khutbah."  

أَنَّ أَبَا سَعِيدٍ الْخُدْرِيَّ دَخَلَ يَوْمَ الْجُمُعَةِ وَمَرْوَانُ يَخْطُبُ فَقَامَ يُصَلِّي فَجَاءَ الْحَرَسُ لِيُجْلِسُوهُ فَأَبَى حَتَّى صَلَّى فَلَمَّا انْصَرَفَ أَتَيْنَاهُ فَقُلْنَا رَحِمَكَ اللَّهُ إِنْ كَادُوا لَيَقَعُوا بِكَ فَقَالَ مَا كُنْتُ لأَتْرُكَهُمَا بَعْدَ شَيْءٍ رَأَيْتُهُ مِنْ رَسُولِ اللَّهِ ﷺ ثُمَّ ذَكَرَ أَنَّ رَجُلاً جَاءَ يَوْمَ الْجُمُعَةِ فِي هَيْئَةٍ بَذَّةٍ وَالنَّبِيُّ ﷺ يَخْطُبُ يَوْمَ الْجُمُعَةِ فَأَمَرَهُ فَصَلَّى رَكْعَتَيْنِ وَالنَّبِيُّ ﷺ يَخْطُبُ قَالَ ابْنُ أَبِي عُمَرَ كَانَ سُفْيَانُ بْنُ عُيَيْنَةَ يُصَلِّي رَكْعَتَيْنِ إِذَا جَاءَ وَالإِمَامُ يَخْطُبُ وَكَانَ يَأْمُرُ بِهِ وَكَانَ أَبُو عَبْدِ الرَّحْمَنِ الْمُقْرِئُ يَرَاهُ