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.
nasai-kubra:588Yaḥyá b. Ḥabīb b. ʿArabī > Khālid > Ibn al-Ḥārith > Ibn ʿAjlān > Zayd b. Aslam > ʿAṭāʾ > Abū Saʿīd

[Machine] On the authority of the Prophet, ﷺ , he said, "If anyone of you has doubt in his prayer, he should dispel the doubt and act upon certainty. Then, if he becomes certain, he should perform two prostrations while sitting."  

الكبرى للنسائي:٥٨٨أَخْبَرَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ قَالَ حَدَّثَنَا خَالِدٌ هُوَ ابْنُ الْحَارِثِ عَنِ ابْنِ عَجْلَانَ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءٍ عَنْ أَبِي سَعِيدٍ

عَنِ النَّبِيِّ ﷺ قَالَ «إِذَا شَكَّ أَحَدُكُمْ فِي صَلَاتِهِ فَلْيُلْغِ الشَّكَّ وَلْيَبْنِ عَلَى الْيَقِينِ فَإِذَا اسْتَيْقَنَ بِالتَّمَامِ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ قَاعِدٌ»  


See similar narrations below:

Collected by Nasāʾī, Nasāʾī's Kubrá, Suyūṭī
nasai:1238Yaḥyá b. Ḥabīb b. ʿArabī > Khālid > Ibn ʿAjlān > Zayd b. Aslam > ʿAṭāʾ b. Yasār > Abū Saʿīd

The Prophet ﷺ said: "If one of you is not sure about his prayer, let him forget about what he is unsure of and complete his prayer on the basis of what he is sure of. When he is sure that he has completed it, let him prostrate twice while he is sitting. Then if he has prayed five (rak'ahs), they (the two prostrations) will make his prayer even-numbered, and if he had prayed four, they will annoy and humiliate the shaitan."  

النسائي:١٢٣٨أَخْبَرَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ قَالَ حَدَّثَنَا خَالِدٌ عَنِ ابْنِ عَجْلاَنَ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنْ أَبِي سَعِيدٍ

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا شَكَّ أَحَدُكُمْ فِي صَلاَتِهِ فَلْيُلْغِ الشَّكَّ وَلْيَبْنِ عَلَى الْيَقِينِ فَإِذَا اسْتَيْقَنَ بِالتَّمَامِ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ قَاعِدٌ فَإِنْ كَانَ صَلَّى خَمْسًا شَفَعَتَا لَهُ صَلاَتَهُ وَإِنْ صَلَّى أَرْبَعًا كَانَتَا تَرْغِيمًا لِلشَّيْطَانِ  

nasai-kubra:1162Yaḥyá b. Ḥabīb b. ʿArabī > Khālid > Ibn ʿAjlān > Zayd b. Aslam > ʿAṭāʾ b. Yasār > Abū Saʿīd

[Machine] On the authority of Prophet Muhammad ﷺ , he said, "If any of you have doubts about your prayer, then set aside those doubts and base it on certainty. And when you are certain, then perform two prostrations while sitting."  

الكبرى للنسائي:١١٦٢أَخْبَرَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ قَالَ حَدَّثَنَا خَالِدٌ عَنِ ابْنِ عَجْلَانَ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنْ أَبِي سَعِيدٍ

عَنِ النَّبِيِّ ﷺ قَالَ «إِذَا شَكَّ أَحَدُكُمْ فِي صَلَاتِهِ فَلْيُلْغِ الشَّكَّ وَلْيَبْنِ عَلَى الْيَقِينِ فَإِذَا اسْتَيْقَنَ بِالتَّمَامِ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ قَاعِدٌ»  

suyuti:422-605bIbn ʿUmar
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السيوطي:٤٢٢-٦٠٥b

"عَنِ ابْنِ عُمَرَ قَالَ: إِذَا شَكَّ أحَدُكُمْ في صَلاَتهِ فَليَتَوَخَّ حَتَّى يَعْلَمَ أنَّهُ قَدْ أتَمَّ، ثمَّ يَسْجُد سَجْدَتَيْنِ وَهُوَ جَالِسٌ".  

[عب] عبد الرازق