Hadith 4982
وَعَنْ أَبِي الدَّرْدَاءِ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «مَا مِنْ مُسْلِمٍ يَرُدُّ عَنْ عِرْضِ أَخِيهِ إِلَّا كَانَ حَقًّا عَلَى اللَّهِ أَنْ يَرُدَّ عَنْهُ نَارَ جَهَنَّمَ يَوْمَ الْقِيَامَةِ» . ثُمَّ تَلَا هَذِهِ الْآيَةَ: (وَكَانَ حَقًّا عَلَيْنَا نصر الْمُؤمنِينَ) رَوَاهُ فِي «شرح السّنة»
Abu Darda (may Allah be pleased with him) narrates: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever defends the honor of his Muslim brother, it is incumbent upon Allah to defend him from Hell on the Day of Resurrection." Then he recited this verse: "Helping the believers is incumbent upon Us." Its chain is weak, narrated in Sharh al-Sunnah.