The meaning of the one with two faces and two tongues

The worst of servants is a servant who has two faces and two tongues; (by which) he is tender with his brother in (his) presence and eats him in (his) absence, (and) if he is given, he envies him, and if he is afflicted,…

I heard al-Sadiq, Ja’far ibn Muhammed, peace be upon them both, say: The one who meets people with one face and is absent from them with another face, will come at the Day of Resurrection whilst having two tongues of…