Sahih al-Bukhari 6671
Narrated Ibn Mas`ud:
that Allah's Prophet led them in the Zuhr prayer and he offered either more or less rak`at, and it was 
said to him, "O Allah's Messenger (ﷺ) ! Has the prayer been reduced, or have you forgotten?" He asked, 
"What is that?" They said, "You have prayed so many rak`at." So he performed with them two more 
prostrations and said, "These two prostrations are to be performed by the person who does not know 
whether he has prayed more or less (rak`at) in which case he should seek to follow what is right. And 
then complete the rest (of the prayer) and perform two extra prostrations."
حَدَّثَنِي إِسْحَاقُ بْنُ إِبْرَاهِيمَ، سَمِعَ عَبْدَ الْعَزِيزِ بْنَ عَبْدِ الصَّمَدِ، حَدَّثَنَا مَنْصُورٌ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، عَنِ ابْنِ مَسْعُودٍ ـ رضى الله عنه أَنَّ نَبِيَّ اللَّهِ صلى الله عليه وسلم صَلَّى بِهِمْ صَلاَةَ الظُّهْرِ، فَزَادَ أَوْ نَقَصَ مِنْهَا ـ قَالَ مَنْصُورٌ لاَ أَدْرِي إِبْرَاهِيمُ وَهِمَ أَمْ عَلْقَمَةُ ـ قَالَ قِيلَ يَا رَسُولَ اللَّهِ أَقَصُرَتِ الصَّلاَةُ أَمْ نَسِيتَ قَالَ ‏"‏ وَمَا ذَاكَ ‏"‏‏.‏ قَالُوا صَلَّيْتَ كَذَا وَكَذَا‏.‏ قَالَ فَسَجَدَ بِهِمْ سَجْدَتَيْنِ ثُمَّ قَالَ ‏"‏ هَاتَانِ السَّجْدَتَانِ لِمَنْ لاَ يَدْرِي، زَادَ فِي صَلاَتِهِ أَمْ نَقَصَ، فَيَتَحَرَّى الصَّوَابَ، فَيُتِمُّ مَا بَقِيَ، ثُمَّ يَسْجُدُ سَجْدَتَيْنِ ‏"‏‏.‏