Hadith

 وَ بِهَذَا اَلْإِسْنَادِ عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ أَبِي اَلْعَلاَءِ عَنْ أَبِي عَبْدِ اَللَّهِ ع قَالَ : إِنَّ اَلْمُؤْمِنَ مَنْ يَخَافُهُ كُلُّ شَيْ‌ءٍ وَ ذَلِكَ أَنَّهُ عَزِيزٌ فِي دِينِ اَللَّهِ وَ لاَ يَخَافُ مِنْ شَيْ‌ءٍ وَ هُوَ عَلاَمَةُ كُلِّ مُؤْمِنٍ.

 (The same previous series of relaters)… from Mohammed bin Ahmed from Abu al-Alaa that Abu Abdullah (a) said: The true believer is feared by everything, for he is powerful in the religion of Allah and he does not fear anything. This is the distinctive feature of the believers.

Ṣifāt al-Shīʿa

Book 1, Chapter 55