وَعَنْ أَنَسٍ رضى الله عنه عَنْ
اَلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «كَفَّارَةٌ مَنْ اِغْتَبْتَهُ أَنْ تَسْتَغْفِرَ لَهُ»
“The atonement of backbiting a man is to ask Allah to forgive him.” Related by Al-Harith ibn Abu Usamah with a weak chain of narrators.
Bulugh al-Maram 1715, Book 16, The Comprehensive Book, Hadith 81. 1 min read