Disbelief

Al-Kāfi|Volume 2|Book 1|Chapter 165
10ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنِ ابْنِ مَحْبُوبٍ عَنْ عَبْدِ الله بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ مَنْ شَكَّ فِي الله وَفِي رَسُولِهِ (صَلَّى اللهُ عَلَيْهِ وآلِه) فَهُوَ كَافِرٌ.
10. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from ibn Mahbub from ‘Abd Allah ibn Sinan from Abu ‘Abdillah عليه السلام who has said the following: “Abu ‘Abd Allah عليه السلام has said, ‘Whoever doubts Allah and the Messenger of Allah is an unbeliever.’”
  • Allamah Baqir al-Majlisi
    Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (11/118)
  • Shaykh Baqir al-Behbudi
    Ṣaḥīḥ al-Kāfī