Al-Kāfi
Hadith 1352- وَبِهَذَا الإسْنَادِ قَالَ قَالَ أَبُو عَبْدِ اللهِ (عَلَيْهِ السَّلام) إِنَّمَا يُؤْمَرُ بِالْمَعْرُوفِ وَيُنْهَى عَنِ الْمُنْكَرِ مُؤْمِنٌ فَيَتَّعِظُ أَوْ جَاهِلٌ فَيَتَعَلَّمُ وَأَمَّا صَاحِبُ سَوْطٍ أَوْ سَيْفٍ فَلا.
2. With this chain of narration, Abu Abdullah (a.s.) said, ‘Verily, enjoining what is good and forbidding what is evil is incumbent upon a believer so he admonishes, or upon an ingorant so he learns from it; but as for the wielder of a whip or a sword, then no.’