Yahya related to me from Malik from Yahya ibn Said from Abd ar- Rahman ibn Hurmuz that Abdullah ibn Buhayna said, "The Messengerof Allah ﷺ prayed dhuhr with us and he stood straight up after two rakas without sitting. When he had finished the prayer, he did two sajdas and then said the taslim after that." Malik said, concerning someone who forgot in his prayer and stood up after he had completed four rakas and recited and then went into ruku and then, when he raised his head from ruku, remembered that he had already completed (his prayer), "He returns to a sitting position and does not do any sajda. If he has already done one sajda I do not think he should do the other. Then when his prayer is finished he does two sajdas from the sitting position after saying the taslim."  

أَنَّهُ قَالَ صَلَّى لَنَا رَسُولُ اللَّهِ ﷺ الظُّهْرَ فَقَامَ فِي اثْنَتَيْنِ وَلَمْ يَجْلِسْ فِيهِمَا فَلَمَّا قَضَى صَلاَتَهُ سَجَدَ سَجْدَتَيْنِ ثُمَّ سَلَّمَ بَعْدَ ذَلِكَ  

The Messenger of Allah ﷺ led us in prayer praying two rak'ahs. When he stood up and did not sit (at the end of two rak'ahs) the people stood up along with him. When he finished the prayer and we expect him to give the salutation, he said: "Allah is most great." While sitting and made two prostrations before giving the salutation. Then he gave it. (Using translation from Abū Dāʾūd 1034)  

أَنَّهُ قَالَ صَلَّى لَنَا رَسُولُ اللهِ ﷺ رَكْعَتَيْنِ ثُمَّ قَامَ فَلَمْ يَجْلِسْ فَقَامَ النَّاسُ مَعَهُ فَلَمَّا قَضَى صَلَاتَهُ وَنَظَرْنَا تَسْلِيمَهُ كَبَّرَ فَسَجَدَ سَجْدَتَيْنِ وَهُوَ جَالِسٌ قَبْلَ التَّسْلِيمِ ثُمَّ سَلَّمَ  

The Messenger of Allah ﷺ led us in prayer praying two rak'ahs. When he stood up and did not sit (at the end of two rak'ahs) the people stood up along with him. When he finished the prayer and we expect him to give the salutation, he said: "Allah is most great." While sitting and made two prostrations before giving the salutation. Then he gave it. (Using translation from Abū Dāʾūd 1034)   

صَلَّى لَنَا رَسُولُ اللهِ ﷺ رَكْعَتَيْنِ ثُمَّ قَامَ وَلَمْ يَجْلِسْ بَعْدَ الرَّكْعَتَيْنِ فَقَامَ النَّاسُ مَعَهُ فَلَمَّا قَضَى صَلَاتَهُ سَجَدَ سَجْدَتَيْنِ وَهُوَ جَالِسٌ قَبْلَ التَّسْلِيمِ ثُمَّ سَلَّمَ  

[Machine] "He performed the first two raka'ahs, and they praised Allah in them. He did not sit down. Then, after he completed his prayer, he performed two prostrations after the tasleem (the final salutation of the prayer). Then, he said: 'This is how the Messenger of Allah ﷺ acted.'"  

أَنَّهُ قَامَ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ فَسَبَّحُوا بِهِ فَلَمْ يَجْلِسْ فَلَمَّا قَضَى صَلَاتَهُ سَجَدَ سَجْدَتَيْنِ بَعْدَ التَّسْلِيمِ ثُمَّ قَالَ هَكَذَا فَعَلَ رَسُولُ اللهِ ﷺ  

"عَنْ قيسِ بنِ أَبِى حَازِمٍ: أَنَّ سَعْدًا قَامَ فِى الرَّكْعَتَيْنِ فَسَبَّحُوا بِهِ فَلَمْ يَجْلِسْ، فَلَمَّا قَضَى صَلَاتَهُ سَجَدَ سَجْدَتَيْنِ وَهُوَ جَالِسٌ".