[Machine] The Prophet ﷺ prayed Dhuhr with them five times, and they said, "You prayed five times." He then prostrated twice after the salaam while he was sitting. 583 Qutaibah ibn Sa'eed informed us, he said: Abu Awana narrated to us from Mughirah, from Ibrahim, that the Prophet ﷺ prayed while he was musallam (i.e. not leading the prayer).  

عَنِ النَّبِيِّ ﷺ أَنَّهُ صَلَّى بِهِمُ الظُّهْرَ خَمْسًا فَقَالُوا إِنَّكَ صَلَّيْتَ خَمْسًا فَسَجَدَ سَجْدَتَيْنِ بَعْدَمَا سَلَّمَ وَهُوَ جَالِسٌ 583 أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ مُغِيرَةَ عَنْ إِبْرَاهِيمَ أَنَّ النَّبِيَّ ﷺ صَلَّى مُرْسَلٌ  

The Messenger of Allah ﷺ offered one of the afternoon prayers with five (rak'ahs), and it was said to him: "Has something been added to the prayer?" He said: 'Why are you asking?' They said: 'You prayed five.' He said: 'I am only human, I forget as you forget, and I remember as you remember.' Then he prostrated twice then ended his prayer. (Using translation from Nasāʾī 1259)  

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى إِحْدَى صَلَاتِي الْعَشِيِّ خَمْسًا فَقِيلَ لَهُ أَزِيدَ فِي الصَّلَاةِ؟ فَقَالَ «وَمَا ذَاكَ؟» قَالُوا صَلَّيْتَ خَمْسًا قَالَ «إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ وَأَذْكُرُ كَمَا تَذْكُرُونَ» فَسَجَدَ سَجْدَتَيْنِ ثُمَّ انْفَتَلَ