Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:7157a –
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السيوطي:٧١٥٧a –

"إِنَّ منَ الكبائِر استطالَةَ الرَّجُلِ في عِرْضِ مُسلمٍ بَغَيْرِ حَق، وإِنَّ من الكبائر السَّبَتَانِ بالسَّبَّةِ -وفى رواية "مِنْ أَرْبَى الرِّبَا استطالَةُ الرَّجُلِ في عِرْضِ الْمُسْلِم ".  

[حم] أحمد وعن سعيد بن زيد

See similar narrations below:

Collected by Abū Dāwūd, Suyūṭī
abudawud:4877 – Jaʿfar b. Musāfir > ʿAmr b. Abū Salamah > Zuhayr > al-ʿAlāʾ b. ʿAbd al-Raḥman from his father > Abū Hurayrah

The Prophet ﷺ said: The gravest sin is going to lengths in talking unjustly against a Muslim's honour, and it is a major sin to abuse twice for abusing once.  

أبو داود:٤٨٧٧ – حَدَّثَنَا جَعْفَرُ بْنُ مُسَافِرٍ حَدَّثَنَا عَمْرُو بْنُ أَبِي سَلَمَةَ قَالَ حَدَّثَنَا زُهَيْرٌ عَنِ الْعَلاَءِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ أَبِيهِ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ مِنْ أَكْبَرِ الْكَبَائِرِ اسْتِطَالَةَ الْمَرْءِ فِي عِرْضِ رَجُلٍ مُسْلِمٍ بِغَيْرِ حَقٍّ وَمِنَ الْكَبَائِرِ السَّبَّتَانِ بِالسَّبَّةِ  

suyuti:23571a –
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السيوطي:٢٣٥٧١a –

"مِنَ الكَبَائِر استطالةُ الرَّجُلِ فِي عِرْضِ أخِيه رجلٍ مُسلمٍ، ومِنَ الكَبائِر السَّبَّتانِ بالسَّبَّةِ".  

ابن أَبي الدنيا في ذم الغضب عن أَبي هريرة