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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

See similar narrations below:

Collected by Ibn Ḥibbān, Ṭabarānī, Nasāʾī's Kubrá

ذِكْرُ الْبَيَانِ بِأَنَّ الْأَمْرَ بِسَجْدَتَيِ السَّهْوِ لِلتَّحَرِّي فِي شَكِّهِ فِي الصَّلَاةِ إِنَّمَا أُمِرَ بِهَا بَعْدَ السَّلَامِ لَا قَبْلُ

ibnhibban:2659ʿAbdullāh b. Muḥammad al-Azdī > Isḥāq b. Ibrāhīm > ʿUbayd b. Saʿīd al-Umawī > Sufyān > Manṣūr > Ibrāhīm > ʿAlqamah > ʿAbdullāh

[Machine] From the Messenger of Allah ﷺ , he said: "If any of you is doubtful about his prayer, let him correct it, then let him offer the salutation, and then let him prostrate twice."  

ابن حبّان:٢٦٥٩أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ الْأَزْدِيُّ قَالَ حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ قَالَ أَخْبَرَنَا عُبَيْدُ بْنُ سَعِيدٍ الْأُمَوِيُّ قَالَ حَدَّثَنَا سُفْيَانُ عَنْ مَنْصُورٍ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللَّهِ

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ «إِذَا شَكَّ أَحَدُكُمْ فِي صَلَاتِهِ فَلْيَتَحَرَّ الصَّوَابَ ثُمَّ لْيُسَلِّمْ ثُمَّ لْيَسْجُدْ سَجْدَتَيْنِ»  

tabarani:9834Muḥammad b. ʿUthmān b. Abū Shaybah from my father > Muʿāwiyah b. Hishām > Sufyān > Ḥuṣayn > Ibrāhīm > ʿAlqamah > ʿAbdullāh

[Machine] The Messenger of Allah ﷺ said, "If any one of you doubts his prayer, then he should strive to do what is right and perform two prostrations of forgetfulness while sitting."  

الطبراني:٩٨٣٤حَدَّثَنَا مُحَمَّدُ بْنُ عُثْمَانَ بْنِ أَبِي شَيْبَةَ حَدَّثَنِي أَبِي ثنا مُعَاوِيَةُ بْنُ هِشَامٍ ثنا سُفْيَانُ عَنْ حُصَيْنٍ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللهِ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِذَا شَكَّ أَحَدُكُمْ فِي صَلَاتِهِ فَلْيَتَحَرَّ الصَّوَابَ وَلْيَسْجُدْ سَجْدَتَيِ السَّهْوِ وَهُوَ جَالِسٌ»  

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»  

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»