Al-Kāfi

1ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ فَضَالَةَ بْنِ أَيُّوبَ عَنِ الْحُسَيْنِ بْنِ عُثْمَانَ عَنِ ابْنِ مُسْكَانَ عَنْ أَبِي بَصِيرٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنِ الرَّجُلِ يَشُكُّ وَهُوَ قَائِمٌ لاَ يَدْرِي رَكَعَ أَمْ لَمْ يَرْكَعْ قَالَ يَرْكَعُ وَيَسْجُدُ.

1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Husayn ibn Sa‘id from Fadalah ibn Ayyub from al-Husayn ibn ‘Uthman from ibn Muskan from abu Basir who has said the following: “I once asked abu ’Abd Allah (a.s.), about a man who in a standing position doubts and does not know if he has performed Ruku‘ (bowing down on one’s knees) or not. He (the Imam) said, ‘He performs Ruku‘ and Sajdah (prostration).”’

2ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ وَمُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ جَمِيعاً عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ رِفَاعَةَ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ سَأَلْتُهُ عَنْ رَجُلٍ نَسِيَ أَنْ يَرْكَعَ حَتَّى يَسْجُدَ وَيَقُومَ قَالَ يَسْتَقْبِلُ.

2. Ali ibn Ibrahim has narrated from his father from and Muhammad ibn ’Isma‘il from al-Fadl ibn Shadhan all from Ibn Abi ‘Umayr from Rifa‘ah who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who forgets performing Ruku‘ (bowing down on one’s knees) until he performs Sajdah (prostration) and stands up. He (the Imam) said, ‘He performs Salah (prayer) again.’”

3ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ عُمَرَ بْنِ أُذَيْنَةَ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلام) قَالَ إِذَا اسْتَيْقَنَ أَنَّهُ قَدْ زَادَ فِي الصَّلاَةِ الْمَكْتُوبَةِ رَكْعَةً لَمْ يَعْتَدَّ بِهَا وَاسْتَقْبَلَ الصَّلاَةَ اسْتِقْبَالاً إِذَا كَانَ قَدِ اسْتَيْقَنَ يَقِيناً.

3. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from ‘Umar ibn ’Udhaynah from Zurarah who has said the following: “Abu Ja‘far (a.s.), has sad, ‘If one is certain that he has increased one Rak‘at in an obligatory Salah (prayer) he disregards it and performs that Salah (prayer) again if he has certainty.’”