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  

The Messenger of Allah ﷺ prayed Zuhr with two rak'ahs, then said the salam. They said: "Has the prayer been shortened?" So he stood up and prayed two rak'ahs, then he said the salam, then he prostrated twice.  

أَنَّ رَسُولَ اللَّهِ ﷺ صَلَّى صَلاَةَ الظُّهْرِ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَقَالُوا أَقُصِرَتِ الصَّلاَةُ فَقَامَ وَصَلَّى رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ  

Abu Hurairah reported; The Prophet ﷺ offered the noon prayer and he gave the salutation at the end of two rakahs. He was asked. Has the prayer been shortened ? then he offered two rakahs of the prayer and made two prostrations (at the end of it).  

أَنَّ النَّبِيَّ ﷺ صَلَّى الظُّهْرَ فَسَلَّمَ فِي الرَّكْعَتَيْنِ فَقِيلَ لَهُ نَقَصَتِ الصَّلاَةُ فَصَلَّى رَكْعَتَيْنِ ثُمَّ سَجَدَ سَجْدَتَيْنِ  

The Messenger of Allah ﷺ prayed Zuhr with two rak'ahs, then said the salam. They said: "Has the prayer been shortened?" So he stood up and prayed two rak'ahs, then he said the salam, then he prostrated twice. (Using translation from Nasāʾī 1227)   

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى الظُّهْرَ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَقِيلَ لَهُ نَقَصَ مِنَ الصَّلَاةِ؟ فَصَلَّى رَكْعَتَيْنِ أُخَرَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ  

[Machine] The Messenger of Allah, ﷺ , prayed Dhuhr or Asr prayer with three units of prayer, then he said the tasleem. A man from the companions of the Prophet, ﷺ , whose nickname was Al-Khirbaq, asked: "Has the prayer been shortened?" So, he asked the Prophet, ﷺ , and when he learned that what he said was true, he prayed one unit of prayer, then said the tasleem, then prostrated for two units of prayer, then said the tasleem.  

صَلَّى رَسُولُ اللهِ ﷺ الظُّهْرَ أَوِ الْعَصْرَ ثَلَاثَ رَكَعَاتٍ ثُمَّ سَلَّمَ فَقَالَ رَجُلٌ مِنْ أَصْحَابِ النَّبِيِّ ﷺيُقَالُ لَهُ الْخِرْبَاقُ أَقُصِرَتِ الصَّلَاةُ؟ فَسَأَلَ النَّبِيُّ ﷺ فَإِذَا هُوَ كَمَا قَالَ قَالَ فَصَلَّى رَكْعَةً ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ ثُمَّ سَلَّمَ  

The Messenger of Allah ﷺ prayed Zuhr with two rak'ahs, then said the salam. They said: "Has the prayer been shortened?" So he stood up and prayed two rak'ahs, then he said the salam, then he prostrated twice. (Using translation from Nasāʾī 1227)  

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى الظُّهْرَ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَقَالُوا أَقَصُرَتِ الصَّلَاةُ فَقَامَ «فَصَلَّى رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ»  

[Machine] The Messenger of Allah, ﷺ , performed two units of the Dhuhr prayer, then he finished and said, "Did the prayer become shorter?" He then stood and performed two units of prayer, then finished and performed two prostrations. Abu Abdur-Rahman said to us, "I do not know anyone who mentioned this hadith from Abu Salamah, except Sa'd."  

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى الظُّهْرَ رَكْعَتَيْنِ ثُمَّ سَلَّمَ فَقَالُوا «أَقَصُرَتِ الصَّلَاةُ فَقَامَ فَصَلَّى رَكْعَتَيْنِ ثُمَّ سَلِمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ» قَالَ لَنَا أَبُو عَبْدِ الرَّحْمَنِ لَا أَعْلَمُ أَحَدًا ذَكَرَ عَنْ أَبِي سَلَمَةَ فِي هَذَا الْحَدِيثِ ثُمَّ سَجَدَ سَجْدَتَيْنِ غَيْرَ سَعْدٍ  

" أَنَّ رَسُولَ الله ﷺ صَلَّى بالنَّاسِ رَكعَتَينِ فَسَهَا فَسَلَّمَ، فَقَالَ لَهُ رَجُل يُقَالُ لَهُ ذُو الْيَدَيْنِ: نَقَصَتِ الصَّلاَةُ؛ فَقَالَ: لاَ، فَصَلَّى رَكْعَتَيْنِ أُخْرَاوَيْنِ ثُمَّ سَلَّمَ، ثُمَّ سَجَدَ سَجْدَتَيْنِ، ثُمَّ سَلَّمَ".  

"أَنَّ النَّبِىَّ ﷺ صَلَّى الظُهْرَ رَكْعَتَيْن ثُمَ سَلَّمَ، فَقِيلَ لَهُ: انْقُصْ من الصَّلَاةِ، فَصَلَّى رَكعَتين أُخَراوَيْن فَسَلَّم، ثُمَ سَجَد سَجْدَتَيْن".