Jabir b. 'Abdullah said that a person entered the Mosque while the Messenger of Allah ﷺ was delivering the sermon on Friday. Upon this he (the Holy Prophet) said: Have you observed prayer? He said: No. He (the Holy Prophet) said: Stand and offer the two rak'ahs. According to Qutaiba, the words are:" He said: Offer two rak'ahs."

وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ قُتَيْبَةُ حَدَّثَنَا وَقَالَ، إِسْحَاقُ أَخْبَرَنَا سُفْيَانُ، عَنْ عَمْرٍو، سَمِعَ جَابِرَ بْنَ عَبْدِ اللَّهِ، يَقُولُ دَخَلَ رَجُلٌ الْمَسْجِدَ وَرَسُولُ اللَّهِ ﷺ يَخْطُبُ يَوْمَ الْجُمُعَةِ فَقَالَ " أَصَلَّيْتَ " . قَالَ لاَ . قَالَ " قُمْ فَصَلِّ الرَّكْعَتَيْنِ " . وَفِي رِوَايَةِ قُتَيْبَةَ قَالَ " صَلِّ رَكْعَتَيْنِ " .