 أَبِی ره قَالَ حَدَّثَنِی أَحْمَدُ بْنُ إِدْرِیسَ عَنْ أَحْمَدَ بْنِ عَبْدِ اللَّهِ عَنْ أَبِیهِ عَنْ أَحْمَدَ بْنِ النَّضْرِ عَنْ عَمْرِو بْنِ شِمْرٍ عَنْ جَابِرٍ عَنْ أَبِی جَعْفَرٍ ع قَالَ: مَا شَهِدَ رَجُلٌ عَلَی رَجُلٍ بِکُفْرٍ قَطُّ إِلَّا فَاتَهُ أَحَدُهُمَا إِنْ کَانَ شَهِدَ عَلَی کَافِرٍ صَدَقَ وَ إِنْ کَانَ مُؤْمِناً رَجَعَ الْکُفْرُ عَلَیْهِ وَ إِیَّاکُمْ وَ الطَّعْنَ عَلَی الْمُؤْمِنِینَ.
1. My father (rah) said: it was narrated to me by Ahmad b. Idris from Ahmad b. Abdillah from his father from Ahmad b. al-Nadhr from ’Amru b. Shimr from Jabir from Abi Ja’far  who said: “One who testifies the disbelief of someone, there can be only two cases viz. either the person is testifying about a disbeliever or this disbelief returns to him. Hence keep away from ridiculing a believer.”