Al-Kāfi
Hadith 1057 5ـ وَبِهَذَا الاسْنَادِ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ مَنْ فَارَقَ جَمَاعَةَ الْمُسْلِمِينَ وَنَكَثَ صَفْقَةَ الامَامِ جَاءَ إِلَى الله عَزَّ وَجَلَّ أَجْذَمَ.
5. Through the same chain of narrators it is narrated from abu ‘Abdallah (a.s.) who has said the following. “Whoever would distance himself from the company of the Muslims and disregard the pledge of allegiance with the Imam he will come before Allah with his hand cut off.”