The Messenger of Allah ﷺ stood up (at the end of two rak'ahs) when he had to sit and proceeded on with the prayer. But when he was at the end of the prayer, he performed a prostration before the salutation and then pronounced the salutation.
أَنَّ رَسُولَ اللَّهِ ﷺ قَامَ فِي الشَّفْعِ الَّذِي يُرِيدُ أَنْ يَجْلِسَ فِي صَلاَتِهِ فَمَضَى فِي صَلاَتِهِ فَلَمَّا كَانَ فِي آخِرِ الصَّلاَةِ سَجَدَ قَبْلَ أَنْ يُسَلِّمَ ثُمَّ سَلَّمَ
The Prophet ﷺ prayed, then he stood up after two rak'ahs while he was supposed to sit, and he continued his prayer. Then at the end of his prayer, he performed two prostrations before the Salam, then he said the Salam.
أَنَّ النَّبِيَّ ﷺ صَلَّى فَقَامَ فِي الشَّفْعِ الَّذِي كَانَ يُرِيدُ أَنْ يَجْلِسَ فِيهِ فَمَضَى فِي صَلاَتِهِ حَتَّى إِذَا كَانَ فِي آخِرِ صَلاَتِهِ سَجَدَ سَجْدَتَيْنِ قَبْلَ أَنْ يُسَلِّمَ ثُمَّ سَلَّمَ
The Prophet ﷺ prayed, then he stood up after two rak'ahs while he was supposed to sit, and he continued his prayer. Then at the end of his prayer, he performed two prostrations before the Salam, then he said the Salam. (Using translation from Nasāʾī 1177)
أَنَّ النَّبِيَّ ﷺ «صَلَّى فَقَامَ فِي الشَّفْعِ الَّذِي كَانَ يُرِيدُ أَنْ يَجْلِسَ فِيهِ فَمَضَى فِي صَلَاتِهِ حَتَّى إِذَا كَانَ فِي آخِرِ صَلَاتِهِ سَجَدَ سَجْدَتَيْنِ قَبْلَ أَنْ يُسَلِّمَ ثُمَّ سَلَّمَ»
The Prophet ﷺ prayed, then he stood up after two rak'ahs while he was supposed to sit, and he continued his prayer. Then at the end of his prayer, he performed two prostrations before the Salam, then he said the Salam. (Using translation from Nasāʾī 1177)
أَنَّ النَّبِيَّ ﷺ صَلَّى فَقَامَ فِي الشَّفْعِ الَّذِي كَانَ يُرِيدُ أَنْ يَجْلِسَ فِيهِ فَمَضَى فِي صَلَاتِهِ حَتَّى إِذَا كَانَ فِي آخِرِ صَلَاتِهِ سَجَدَ سَجْدَتَيْنِ قَبْلَ أَنْ يُسَلِّمَ ثُمَّ سَلَّمَ
[Machine] The Messenger of Allah ﷺ stood in the shaf' (middle) position, which he intended to sit in his prayer. He continued with his prayer, and when he reached the end of the prayer, he prostrated before giving the salutation (salam).
أَنَّ رَسُولَ اللهِ ﷺ قَامَ فِي الشَّفْعِ الَّذِي يُرِيدُ أَنْ يَجْلِسَ فِي صَلَاتِهِ فَمَضَى فِي صَلَاتِهِ فَلَمَّا كَانَ فِي آخِرِ الصَّلَاةِ سَجَدَ قَبْلَ أَنْ يُسَلِّمَ ثُمَّ سَلَّمَ