Muhammad b. Musa b. al-Mutawakkil narrated to us. He said: `Abdullah b. Ja`far al-Himyari narrated to us from Ahmad b. Muhammad b. `Isa from al-Hasan b. Mahbub from `Abd al-Rahman b. Siyaba from al-Sadiq Ja`far b. Muhammad . He said:

Backbiting (ghiba) includes saying regarding your brother that which Allah has hidden. Slander (buhtan) includes saying regarding your brother that which is not [true] in him.