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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
suyuti:422-604b – Ibn ʿUmar
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السيوطي:٤٢٢-٦٠٤b –

"عَنِ ابْنِ عُمَرَ قَالَ: إِذَا شَكَّ الرَّجُلُ في صَلاَتهِ فَلَمْ يَدْرِ أَثَلاثًا أَمْ أرْبَعًا، فَليَبْنِ عَلَى أَتَمِّ ذَلِكَ في نَفْسِهِ، وَلَيْسَ عَلَيْهِ سُجُودٌ".  

[عب] عبد الرازق

See similar narrations below:

Collected by Ṭabarānī
tabarani:9361 – Isḥāq b. Ibrāhīm > ʿAbd al-Razzāq > Maʿmar > Manṣūr > Ibrāhīm > ʿAlqamah > Ibn Masʿūd

[Machine] "If a man is unsure about his prayer and cannot determine whether he prayed three or two units, then he should base it on the more reliable option, and then he should perform the two prostrations of forgetfulness."  

الطبراني:٩٣٦١ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ عَنْ عَبْدِ الرَّزَّاقِ عَنْ مَعْمَرٍ عَنْ مَنْصُورٍ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنِ ابْنِ مَسْعُودٍ قَالَ

«إِذَا شَكَّ الرَّجُلُ فِي صَلَاتِهِ فَلَمْ يَدْرِ أَثْلَاثًا صَلَّى أَمِ اثْنَتَيْنِ؟ فَلْيَبْنِ عَلَى أَوْثَقِ ذَلِكَ ثُمَّ يَسْجُدْ سَجْدَتَيِ السَّهْوِ»