The Book of Asceticism · Hadith 8 (#Ḥadīth #5)
Chapter 1 | On silence Except when Speaking what is Good, Abandonment of what does not concern one, and Slander
علي بن النعمان عن ابن مسكان عن داود عن أبي شيبة الزهري عن أحدهما عليهما السلام قال: بئس العبد عبدا يكون ذا وجهين وذا لسانين يطرى أخاه شاهدا ويأكله غائبا ان اعطى حسده وان ظلم خذله.
5.ʿAlī ibn al-Nuʿmān narrated from Ibn Muskān, from Dāwūd, from Abū Shaybah al-Zuhrī, from one of the two (Imam al-Bāqir or al-Ṣādiq) who said, “The worst servant [of Allah] is he who possesses a doubleface and a forked-tongue, he compliments his brother in his presence yet backbites him in his absence. When he is given, he envies him and when he is wronged, he abandons him.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).