"I said to Abu Sa'eed: 'One of us performs Salat and we do not know how (much) we prayed.' So he said: 'Messenger of Allah (S) said: "When one of you performs Salat and he does now know how (much) he prayed then let him perform two prostrations while he is sitting."  

قُلْتُ لأَبِي سَعِيدٍ أَحَدُنَا يُصَلِّي فَلاَ يَدْرِي كَيْفَ صَلَّى فَقَالَ قَالَ رَسُولُ اللَّهِ ﷺ إِذَا صَلَّى أَحَدُكُمْ فَلَمْ يَدْرِ كَيْفَ صَلَّى فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ قَالَ وَفِي الْبَابِ عَنْ عُثْمَانَ وَابْنِ مَسْعُودٍ وَعَائِشَةَ وَأَبِي هُرَيْرَةَ  

“One of us prays and he does not know how many (Rak’ah) he has prayed.” He said: “The Messenger of Allah ﷺ said: ‘When anyone of you prays and does not know how many he has prayed, let him perform two prostrations while he is sitting.’”  

أَحَدُنَا يُصَلِّي فَلاَ يَدْرِي كَمْ صَلَّى فَقَالَ قَالَ رَسُولُ اللَّهِ ﷺ إِذَا صَلَّى أَحَدُكُمْ فَلَمْ يَدْرِ كَمْ صَلَّى فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ  

[Machine] Indeed, one of us may pray without knowing how much he has prayed. So he said, the Messenger of Allah ﷺ said, "If one of you prays and does not know how much he has prayed, then let him perform two prostrations while sitting. And when one of you is approached by Satan and he says, 'You have done something new in your prayer,' then let him say, 'I have not done anything new except that I sensed a smell with my nose or heard a sound with my ear.'"  

إِنَّ أَحَدَنَا يُصَلِّي فَلَا يَدْرِي كَمْ صَلَّى؟ فَقَالَ قَالَ رَسُولُ اللهِ ﷺ إِذَا صَلَّى أَحَدُكُمْ فَلَمْ يَدْرِ كَمْ صَلَّى فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ فَإِذَا جَاءَ أَحَدَكُمُ الشَّيْطَانُ فَقَالَ إِنَّكَ قَدْ أَحْدَثْتَ فِي صَلَاتِكَ فَلْيَقُلْ كَذَبْتَ إِلَّا مَا وَجَدَ رِيحًا بِأَنْفِهِ أَوْ سَمِعَ صَوْتًا بِأُذُنِهِ  

[Machine] I said to Abu Sa'id al-Khudri, "One of us prays but does not know how much he has prayed." He replied, "The Messenger of Allah ﷺ said, 'If any one of you prays and does not know how much he has prayed, he should perform two prostrations while sitting. And if one of you is unsure whether he has spoken, he should say, 'I have not spoken except what my nose has smelled or my ear has heard.'"  

قُلْتُ لِأَبِي سَعِيدٍ الْخُدْرِيِّ أَحَدُنَا يُصَلِّي فَلَا يَدْرِي كَمْ صَلَّى فَقَالَ قَالَ رَسُولُ اللهِ ﷺ إِذَا صَلَّى أَحَدُكُمْ فَلَمْ يَدْرِ كَمْ صَلَّى فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ وَإِذَا جَاءَ أَحَدَكُمُ الشَّيْطَانُ فَقَالَ إِنَّكَ قَدْ أَحْدَثْتَ فَلْيَقُلْ كَذَبْتَ إِلَّا مَا وَجَدَ رِيحَهُ بِأَنْفِهِ أَوْ سَمِعَ صَوْتَهُ بِأُذُنِهِ