"The Prophet ﷺ prayed Zuhr 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.' So he turned around and prostrated twice." (Using translation from Nasāʾī 1254)
أَنَّ النَّبِيَّ ﷺ صَلَّى الظُّهْرَ خَمْسًا فَقِيلَ زِيدَ فِي الصَّلَاةِ؟ قِيلَ صَلَّيْتَ خَمْسًا فَسَجَدَ سَجْدَتَيْنِ