Al-Kāfi

Hadith 1378
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9ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ عَلِيِّ بْنِ أَسْبَاطٍ عَنْ سَيْفِ بْنِ عَمِيرَةَ عَنْ عَبْدِ الأعْلَى بْنِ أَعْيَنَ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ مَنْ كَانَ يُؤْمِنُ بِالله وَالْيَوْمِ الآخِرِ فَلا يَجْلِسُ مَجْلِساً يُنْتَقَصُ فِيهِ إِمَامٌ أَوْ يُعَابُ فِيهِ مُؤْمِنٌ.
9. Ali ibn Ibrahim has narrated from his father from Ali ibn Asbat from Sayf ibn ‘Amirah from ‘Abd al-‘Ala’ ibn ‘Ayun from Abu ‘Abdillah (a.s.) who has said the following: “Whoever believes in Allah and in the Day of Judgment must not sit in a seat whereby an Imam is belittled or a believer is criticized.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī