The Messenger of Allah ﷺ gave the salutation at the end of three rakahs in the afternoon prayer, then went into the apartment (according to the version of maslamah). A man called al-Khirbaq who had long arms got up and said ; has the prayer been shortened, Messenger of Allah ? He came out angrily trailing his cloak and said : Is he telling the truth ? they said; Yes. He then prayed that rakah, then gave the salutation, then made two prostrations, then gave the salutation.  

سَلَّمَ رَسُولُ اللَّهِ ﷺ فِي ثَلاَثِ رَكَعَاتٍ مِنَ الْعَصْرِ ثُمَّ دَخَلَ قَالَ عَنْ مَسْلَمَةَ الْحُجَرَ فَقَامَ إِلَيْهِ رَجُلٌ يُقَالُ لَهُ الْخِرْبَاقُ كَانَ طَوِيلَ الْيَدَيْنِ فَقَالَ لَهُ أَقَصُرَتِ الصَّلاَةُ يَا رَسُولَ اللَّهِ فَخَرَجَ مُغْضَبًا يَجُرُّ رِدَاءَهُ فَقَالَ أَصَدَقَ قَالُوا نَعَمْ فَصَلَّى تِلْكَ الرَّكْعَةَ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْهَا 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 قَالُوا قَصُرَتِ الصَّلَاةُ؟ قَالَ فَقَامَ فَصَلَّى رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ بَعْدَ مَا سَلَّمَ  

[Machine] The Messenger of Allah ﷺ performed either Dhuhr or Asr prayer with three units of prayer. Then, a man named Al-Khirbaaq said to him, "O Messenger of Allah, you only prayed three units of prayer." The Messenger of Allah ﷺ asked him, "Is that how it seems to you?" They replied, "Yes." So, the Messenger of Allah ﷺ prayed one more unit of prayer, then made the testimony of faith, and concluded the prayer. Then, he performed two prostrations of forgetfulness.  

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى الظُّهْرَ أَوِ الْعَصْرَ ثَلَاثَ رَكَعَاتٍ فَقَالَ لَهُ رَجُلٌ يُقَالُ لَهُ الْخِرْبَاقُ يَا رَسُولَ اللهِ إِنَّمَا صَلَّيْتَ ثَلَاثَ رَكَعَاتٍ فَقَالَ «أَكَذَاكَ؟» قَالُوا نَعَمْ فَصَلَّى رَكْعَةً ثُمَّ تَشَهَّدَ وَسَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيِ السَّهْوِ  

[Machine] The Messenger of Allah ﷺprayed the afternoon prayer of three units (rak'ahs), then a man named Al-Khirbaq approached him and said, "O Messenger of Allah, mention to me what you did." So the Prophet ﷺ became angry and dragged his garment until he reached the people. He then said, "Did he say the truth?" They replied, "Yes." So he prayed that unit (rak'ah) and then made the prostration of forgetfulness (sujood as-sahw), followed by the final salutation.  

صَلَّى رَسُولُ اللهِ ﷺ الْعَصْرَ ثَلَاثَ رَكَعَاتٍ ثُمَّ دَخَلَ فَقَامَ إِلَيْهِ رَجُلٌ يُقَالُ لَهُ الْخِرْبَاقُ فَقَالَ يَا رَسُولَ اللهِ يَذْكُرُ لَهُ الَّذِي صَنَعَ فَخَرَجَ مُغْضَبًا يَجُرُّ رِدَاءَهُ حَتَّى انْتَهَى إِلَى النَّاسِ فَقَالَ «أَصَدَقَ هَذَا؟» قَالُوا نَعَمْ فَصَلَّى تِلْكَ الرَّكْعَةَ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ ثُمَّ سَلَّمَ  

[Machine] That the Messenger of Allah ﷺ prayed three units of either Dhuhr or Asr prayer, and a man known as Al-Khirbaq said to him, "O Messenger of Allah, you only prayed three units." He said, "Is that so?" They said, "Yes." He said, "Then he stood and prayed, then he prostrated, then he recited the Tashahhud and gave the greeting of peace, then he prostrated twice for forgetfulness, then he gave the greeting of peace. This is the correct narration, and Allah knows best."  

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى الظُّهْرَ أَوِ الْعَصْرَ ثَلَاثَ رَكَعَاتٍ فَقَالَ لَهُ رَجُلٌ يُقَالُ لَهُ الْخِرْبَاقُ يَا رَسُولَ اللهِ إِنَّمَا صَلَّيْتَ ثَلَاثَ رَكَعَاتٍ قَالَ أَكَذَلِكَ؟ قَالُوا نَعَمْ قَالَ فَقَامَ فَصَلَّى ثُمَّ سَجَدَ ثُمَّ تَشَهَّدَ وَسَلَّمَ وَسَجَدَ سَجْدَتَيِ السَّهْوِ ثُمَّ سَلَّمَ هَذَا هُوَ الصَّحِيحُ بِهَذَا اللَّفْظِ وَاللهُ أَعْلَمُ