٣ـ 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 , 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.’” 