It is narrated from Sayyiduna Sa'd bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "Abusing a Muslim is wickedness and a sin."
Hadith Referenceالادب المفرد / كتاب السباب / 429
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه النسائي ، كتاب المحاربة ، باب قتال المسلم : 4110 و ابن ماجه : 3941»
It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was neither indecent in speech, nor one who cursed, nor one who abused. Rather, when he became angry, he would (only) say: "What is the matter with him, may his forehead be dust-covered."
Hadith Referenceالادب المفرد / كتاب السباب / 430
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري ، كتاب الأدب : 6031 - انظر الصحيحة : 282»
It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that it is reported from the Prophet (peace and blessings of Allah be upon him): "Abusing a Muslim is a sin, and fighting him is disbelief."
Hadith Referenceالادب المفرد / كتاب السباب / 431
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري ، كتاب الإيمان ، باب خوف المومن من أن يحبط عمله ........ : 48 ، 6044 ، 7076 و مسلم : 64 و النسائي : 4111 و الترمذي : 1983 و ابن ماجه : 69»
It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him), he says: I heard the Prophet (peace and blessings of Allah be upon him) say: "When a man calls another man a disbeliever or a sinner, and he is not so, then this (statement) returns upon him (and he becomes as such)."
Hadith Referenceالادب المفرد / كتاب السباب / 432
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري ، كتاب الأدب : 6044 و مسلم : 61 - انظر الصحيحة : 2891»
With this chain of narration, it is reported from Sayyiduna Abu Dharr (may Allah be pleased with him) that he heard the Prophet (peace and blessings of Allah be upon him) say: "Whoever knowingly claims someone other than his father as his father, he has committed disbelief (kufr) (with Allah). Similarly, whoever claims to belong to a people while he is not one of them, he should take his place in the Fire. And whoever calls a man a disbeliever (kafir) or says, 'O enemy of Allah,' while he is not so, then its consequence will return upon the one who said it."
Hadith Referenceالادب المفرد / كتاب السباب / 433
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري ، كتاب المناقب ، باب : 5 ، 3508 ، 6045 و مسلم : 61»
It is narrated from Sayyiduna Sulaiman bin Surad (may Allah be pleased with him), who was a companion of the Prophet (peace and blessings be upon him), that two men quarreled in the presence of the Prophet (peace and blessings be upon him). One of them became angry, and his anger was so intense that the expression on his face changed and he swelled up. Then the Prophet (peace and blessings be upon him) said: "I know a word; if this person were to say it, surely his anger would go away." So a man (Sayyiduna Mu'adh, may Allah be pleased with him) went to him and told him what the Prophet (peace and blessings be upon him) had said, and said: Seek refuge with Allah from the evil of the accursed devil. The man replied: Do you think I am sick? Am I mad? Go away.
Hadith Referenceالادب المفرد / كتاب السباب / 434
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري ، كتاب الأدب : 6048 ومسلم : 2610 و أبوداؤد : 4781 و النسائي فى الكبريٰ : 10152»
It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), he said: There is a veil from Allah between every two Muslims. When one of them speaks abusively, he tears the veil of Allah. And when one of them says to the other, "You are a disbeliever," then one of them becomes a disbeliever.
Hadith Referenceالادب المفرد / كتاب السباب / 435
Hadith Gradingالألبانی:ضعيف
Hadith Takhrij«ضعيف : أخرجه الطبراني فى الكبير : 224/10 و البيهقي فى شعب الإيمان : 5017»