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»