سَأَلْتُ أَبَا عَبْدِ اللَّهِ ع عَنِ الرَّجُلِ يَشُكُّ وَ هُوَ قَائِمٌ لَا يَدْرِي رَكَعَ أَمْ لَمْ يَرْكَعْ قَالَ يَرْكَعُ وَ يَسْجُدُ.
“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).”’
سَأَلْتُهُ عَنْ رَجُلٍ نَسِيَ أَنْ يَرْكَعَ حَتَّى يَسْجُدَ وَ يَقُومَ قَالَ يَسْتَقْبِلُ.
“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.’”
إِذَا اسْتَيْقَنَ أَنَّهُ قَدْ زَادَ فِي الصَّلَاةِ الْمَكْتُوبَةِ رَكْعَةً[3] لَمْ يَعْتَدَّ بِهَا وَ اسْتَقْبَلَ الصَّلَاةَ اسْتِقْبَالًا إِذَا كَانَ قَدِ اسْتَيْقَنَ يَقِيناً.
“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.’”