Once Messenger of Allah ﷺ prayed two rakʿat (instead of four) and finished his prayer. Dhul-Yadain asked him whether the prayer had been reduced or whether he had forgotten. Messenger of Allah ﷺ asked the people whether Dhul-Yadain was telling the truth. The people replied in the affirmative. Then Allah's Apostle stood up, offered the remaining two rakʿat and then finished his prayer with Taslim and then said, "Allahu Akbar." He followed it with two prostrations like ordinary prostrations or a bit longer.  

أَنَّ رَسُولَ اللَّهِ ﷺ انْصَرَفَ مِنَ اثْنَتَيْنِ فَقَالَ لَهُ ذُو الْيَدَيْنِ أَقَصُرَتِ الصَّلاَةُ أَمْ نَسِيتَ يَا رَسُولَ اللَّهِ فَقَالَ رَسُولُ اللَّهِ ﷺ أَصَدَقَ ذُو الْيَدَيْنِ فَقَالَ النَّاسُ نَعَمْ فَقَامَ رَسُولُ اللَّهِ ﷺ فَصَلَّى اثْنَتَيْنِ أُخْرَيَيْنِ ثُمَّ سَلَّمَ ثُمَّ كَبَّرَ فَسَجَدَ مِثْلَ سُجُودِهِ أَوْ أَطْوَلَ  

The Prophet ﷺ prayed two rakʿat of Zuhr prayer (instead of four) and he was told that he had prayed two rakʿat only. Then he prayed two more rakʿat and finished them with the Taslim followed by two prostrations.  

صَلَّى النَّبِيُّ ﷺ الظُّهْرَ رَكْعَتَيْنِ فَقِيلَ صَلَّيْتَ رَكْعَتَيْنِ فَصَلَّى رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ