The Sufficient (Vol 2) · Hadith 1306 (#Ḥadīth #4)
Chapter 148 | Backbiting and Accusations
4ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ أَبِي عَبْدِ الله عَنْ أَبِيهِ عَنْ هَارُونَ بْنِ الْجَهْمِ عَنْ حَفْصِ بْنِ عُمَرَ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ سُئِلَ النَّبِيُّ (صَلَّى اللهُ عَلَيْهِ وآلِه) مَا كَفَّارَةُ الإغْتِيَابِ قَالَ تَسْتَغْفِرُ الله لِمَنِ اغْتَبْتَهُ كُلَّمَا ذَكَرْتَهُ.
4. A number of our people have narrated from Ahmad ibn abu ‘Abd Allah from his father from Harun ibn al-Jahm from Hafs ibn ‘Umar from Abu ‘Abdillah who has said the following: “The Holy Prophet was asked, ‘What is the expiation for backbiting?’ He said, ‘It is to ask forgiveness from Allah for the person backbitten whenever one remembers him. ’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).