The case of those who would claim to be the Imam but is not qualified, the case of those who would reject all or some of the Imams and the case of those who argue in support of one who is not a qualified Imam.

Al-Kāfi|Volume 1|Book 4|Chapter 85
Al-Kāfi

Book 4, Chapter 85

The case of those who would claim to be the Imam but is not qualified, the case of those who would reject all or some of the Imams and the case of those who argue in support of one who is not a qualified Imam.

3ـ الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ مُعَلَّى بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ جُمْهُورٍ عَنْ عَبْدِ الله بْنِ عَبْدِ الرَّحْمَنِ عَنِ الْحُسَيْنِ بْنِ الْمُخْتَارِ قَالَ قُلْتُ لابِي عَبْدِ الله (عَلَيْهِ السَّلام) جُعِلْتُ فِدَاكَ وَيَوْمَ الْقِيامَةِ تَرَى الَّذِينَ كَذَبُوا عَلَى الله قَالَ كُلُّ مَنْ زَعَمَ أَنَّهُ إِمَامٌ وَلَيْسَ بِإِمَامٍ قُلْتُ وَإِنْ كَانَ فَاطِمِيّاً عَلَوِيّاً قَالَ وَإِنْ كَانَ فَاطِمِيّاً عَلَوِيّاً.
3. Al-Husayn ibn Muhammad has narrated from Mu‘alla ibn Muhammad from mmd ibn Jumhur from ‘Abdallah ibn ‘Abd al-Rahman from al-Husayn ibn al-Mukhtar who has said the following. “I said to abu ‘Abdallah عليه السلام May Allah take my soul in service for your cause, what is the meaning of the words of Allah, ‘On the Day of Judgment you will see the faces of those who had invented falsehood against God blackened. . .”? (39:60). He said, “Itrefers to whoever would claim to be the Imam and, in fact, is not the Imam.” I then asked, “Even if he would a descendant of Fatima and Ali عليه السلام?” He said, “Yes, even if he would a descendant of Fatima and Ali عليه السلام.”
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    Ṣaḥīḥ al-Kāfī