The Messenger of Allah ﷺ prayed five rak’ahs in the noon prayer. He was asked whether the prayer had been extended. He asked what they meant by that. The people said : you prayed five rak’ahs. Then he made two prostrations after having given the salutation. (Using translation from Abū Dāʾūd 1019)
أَنَّ النَّبِيَّ ﷺ صَلَّى الظُّهْرَ خَمْسًا فَقِيلَ لَهُ زِيدَ فِي الصَّلَاةِ؟ قَالَ وَمَا ذَاكَ؟ قَالُوا صَلَّيْتَ خَمْسًا قَالَ فَثَنَى رِجْلَهُ ثُمَّ سَجَدَ سَجْدَتَيْنِ بَعْدَمَا سَلَّمَ