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 قَالُوا قَصُرَتِ الصَّلَاةُ؟ قَالَ فَقَامَ فَصَلَّى رَكْعَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ بَعْدَ مَا 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 فَقِيلَ لَهُ نَقَصَ مِنَ الصَّلَاةِ؟ فَصَلَّى رَكْعَتَيْنِ أُخَرَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ
[Machine] The Messenger of Allah, ﷺ , prayed five units of Dhuhr prayer. They said to him, "O Prophet of Allah, should we increase in the prayer?" So he gave the Salam (ending prayer) and then performed two prostrations of forgetfulness.
صَلَّى رَسُولُ اللهِ ﷺ الظُّهْرَ خَمْسَ رَكَعَاتٍ فَقَالُوا لَهُ يَا نَبِيَّ اللهِ أَزِيدَ فِي الصَّلَاةِ؟ فَسَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيِ الْوَهْمِ
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»
"أَنَّ النَّبِىَّ ﷺ صَلَّى الظُهْرَ رَكْعَتَيْن ثُمَ سَلَّمَ، فَقِيلَ لَهُ: انْقُصْ من الصَّلَاةِ، فَصَلَّى رَكعَتين أُخَراوَيْن فَسَلَّم، ثُمَ سَجَد سَجْدَتَيْن".