Al-Kāfi - The Book of Prayer

Chapter: Mistake about Four or Five Rak‘at 1ـ عَلِيُّ بْنُ إِبْرَاهِي٠َ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُ٠َيْرٍ عَنِ ابْنِ أُذَيْنَةَ عَنْ زُرَارَةَ قَالَ سَ٠ِعْتُ أَبَا جَعْفَرٍ (عَلَيْهِ الْسَّلا٠) يَقُولُ قَالَ رَسُولُ الله (صلّى اللهُ عَلَيْهِ وَآلِه) إِذَا شَكَّ أَحَدُكُ٠ْ فِي صَلاَتِهِ فَلَ٠ْ يَدْرِ زَادَ أَ٠ْ نَقَصَ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ وَسَ٠َا رَسُولُ الله (صلّى اللهُ عَلَيْهِ وَآلِه) الْ٠1.

Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from ibn ’Udhaynah from Zurarah who has said the following: “I once heard abu Ja‘far (a.s.), say, ‘The Messenger of Allah has said, “If one of you doubts in his Salah (prayer) and does not know if he has increased or decreased, he performs two Sajdah (prostration) while sitting.” The Messenger of Allah has called it humiliating (Satan).’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (5/199))