11ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ صَفْوَانَ عَنْ مَنْصُورِ بْنِ حَازِمٍ قَالَ
قُلْتُ لأبِي عَبْدِ الله (عَلَيهِ السَّلام) مَنْ شَكَّ فِي رَسُولِ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) قَالَ كَافِرٌ قُلْتُ فَمَنْ شَكَّ فِي كُفْرِ الشَّاكِّ فَهُوَ كَافِرٌ فَأَمْسَكَ عَنِّي فَرَدَدْتُ عَلَيْهِ ثَلاثَ مَرَّاتٍ فَاسْتَبَنْتُ فِي وَجْهِهِ الْغَضَبَ.
11. Ali ibn Ibrahim has narrated from his father from Safwan from Mansur ibn Hazim who has said the following: “Once I asked Abu ‘Abdillah 
‘What if one doubts the Messenger of Allah?’
The Imam said, ‘He is an unbeliever.’ I then asked, ‘What if one doubts the disbelief of such a doubting person? Is he also an unbeliever?’ The Imam did not answer me and I asked it three times. Then 1 noticed anger on his face?”’
