Punishment of a person who double-talks
Thawāb al-Aʿmāl wa ʿiqāb al-Aʿmāl|Volume 1|Book 3|Chapter 114
وَ بِهَذَا الْإِسْنَادِ عَنْ عَبْدِ اللَّهِ بْنِ مُسْکَانَ عَنْ دَاوُدَ بْنِ فَرْقَدٍ عَنْ أَبِی شَیْبَهَ الزُّهْرِیِّ عَنْ أَبِی جَعْفَرٍ ع قَالَ: بِئْسَ الْعَبْدُ عبدا [عَبْدٌ] هُمَزَهٌ لُمَزَهٌ یُقْبِلُ بِوَجْهِهِ وَ یُدْبِرُ بِآخَرَ.
4. And from the previous chain from Abdillah b. Muskan from Dawud b. Farqad from Abi Shaybah al-Zuhri from Abi Ja’far عليه السلام who said: “A person who talks bad about each and every small thing is a sinner. He faces people with a face and has another on their back.”