Al-Kāfi - The Book of Prayer

Chapter: Mistake about Four or Five Rak‘at َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َّدِ بْنِ عِيسَى عَنْ عُثْ٠َانَ بْنِ عِيسَى عَنْ سَ٠َاعَةَ قَالَ قَالَ ٠َنْ حَفِظَ سَهْوَهُ وَأَتَ٠َّهُ فَلَيْسَ عَلَيْهِ سَجْدَتَا السَّهْوِ إِنَّ٠َا السَّهْوُ عَلَى ٠ْ يَدْرِ زَادَ أَ٠4.

Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from ‘Uthman ibn ‘Isa from Sama‘ah who has said the following: “He (the Imam) (a.s.), has said, ‘If one knows the kind of mistake he has made and completes it then Sajdah (prostration) for mistake is not necessary for him.

Sajdah (prostration) for mistake is upon one who does not know if he has increased or decreased something in Salah (prayer).”’ وثق - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/201))