Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:595 – ʿImrān b. Yazīd > Ismāʿīl b. ʿAbdullāh / Ibn Samāʿah > al-Awzāʿī > al-Zuhrī Wayaḥyá > Abū Salamah > Abū Hurayrah
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الكبرى للنسائي:٥٩٥ – أَخْبَرَنِي عِمْرَانُ بْنُ يَزِيدَ قَالَ حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَبْدِ اللهِ وَهُوَ ابْنُ سَمَاعَةَ عَنِ الْأَوْزَاعِيِّ قَالَ حَدَّثَنِي الزُّهْرِيُّ وَيَحْيَى عَنْ أَبِي سَلَمَةَ عَنْ أَبِي هُرَيْرَةَ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِذَا لَبَّسَ الشَّيْطَانُ عَلَى أَحَدِكُمْ فِي صَلَاتِهِ فَلَمْ يَدْرِ أَثَلَاثًا صَلَّى أَمْ أَرْبَعًا فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ»  

See similar narrations below:

Collected by Tirmidhī, Aḥmad, Suyūṭī
tirmidhi:397 – Qutaybah > al-Layth > Ibn Shihāb > Abū Salamah > Abū Hurayrah

Messenger of Allah (S) said: "Indeed the Shaitan comes to one of you in his Salat confusing him until he does now know how much he has prayed. When one of you experiences that then let him perform two prostrations while sitting."  

Abū ʿĪsá said that this Ḥadīth is Ḥasan-Ṣaḥīḥ.
الترمذي:٣٩٧ – حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا اللَّيْثُ عَنِ ابْنِ شِهَابٍ عَنْ أَبِي سَلَمَةَ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ الشَّيْطَانَ يَأْتِي أَحَدَكُمْ فِي صَلاَتِهِ فَيَلْبِسُ عَلَيْهِ حَتَّى لاَ يَدْرِي كَمْ صَلَّى فَإِذَا وَجَدَ ذَلِكَ أَحَدُكُمْ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ
ahmad:7694 – ʿAbd al-Razzāq And Ibn Bakr > Ibn Jurayj > Ibn Shihāb > Abū Salamah b. ʿAbd al-Raḥman > Abū Hurayrah

Messenger of Allah (S) said: "Indeed the Shaitan comes to one of you in his Salat confusing him until he does now know how much he has prayed. When one of you experiences that then let him perform two prostrations while sitting." (Using translation from Tirmidhī 397)   

أحمد:٧٦٩٤ – حَدَّثَنَا عَبْدُ الرَّزَّاقِ وَابْنُ بَكْرٍ قَالَا أَخْبَرَنَا ابْنُ جُرَيْجٍ أَخْبَرَنِي ابْنُ شِهَابٍ عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ عَنْ أَبِي هُرَيْرَةَ

أَنَّهُ قَالَ قَالَ رَسُولُ اللهِ ﷺ يَأْتِي أَحَدَكُمُ الشَّيْطَانُ وَهُوَ فِي صَلَاتِهِ فَيَلْبِسُ عَلَيْهِ حَتَّى لَا يَدْرِيَ كَمْ صَلَّى فَإِذَا وَجَدَ ذَلِكَ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ  

ahmad:7822 – ʿAbd al-Razzāq > Maʿmar And ʿAbduālʾaʿlá > Maʿmar > al-Zuhrī > Abū Salamah > Abū Hurayrah

Messenger of Allah (S) said: "Indeed the Shaitan comes to one of you in his Salat confusing him until he does now know how much he has prayed. When one of you experiences that then let him perform two prostrations while sitting." (Using translation from Tirmidhī 397)   

أحمد:٧٨٢٢ – حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا مَعْمَرٌ وَعَبْدُالْأَعْلَى عَنْ مَعْمَرٍ عَنِ الزُّهْرِيِّ عَنْ أَبِي سَلَمَةَ عَنِ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ يَأْتِي أَحَدَكُمُ الشَّيْطَانُ فَيَلْبِسُ عَلَيْهِ فِي صَلَاتِهِ فَلَا يَدْرِي أَزَادَ أَمْ نَقَصَ فَإِذَا وَجَدَ أَحَدُكُمْ ذَلِكَ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ  

suyuti:2020a –
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السيوطي:٢٠٢٠a –

"إذا سَهَا أحدُكم في صلاتِه فلا يدْرى أزَادَ أمْ نقصَ؟ فليسْجدْ سجْدتين وهُوَ جَالِسٌ، ثُمَّ يُسَلِّم" .  

[ق] البيهقى في السنن وابن عساكر عن أبي هريرة