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Narrated Ad-Dhahak:

that the Prophet ﷺ said: "It is not for a slave (of Allah) to vow about something he does not possess, and cursing a believer is like killing him, and whoever accuses a believer of disbelief, then it is like he has killed him, and whoever kills himself with something, then Allah will punish him with whatever he killed himself with on the Day of Judgement."
حَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ، حَدَّثَنَا إِسْحَاقُ بْنُ يُوسُفَ الأَزْرَقُ، عَنْ هِشَامٍ الدَّسْتَوَائِيِّ، عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ، عَنْ أَبِي قِلاَبَةَ، عَنْ ثَابِتِ بْنِ الضَّحَّاكِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ لَيْسَ عَلَى الْعَبْدِ نَذْرٌ فِيمَا لاَ يَمْلِكُ وَلاَعِنُ الْمُؤْمِنِ كَقَاتِلِهِ وَمَنْ قَذَفَ مُؤْمِنًا بِكُفْرٍ فَهُوَ كَقَاتِلِهِ وَمَنْ قَتَلَ نَفْسَهُ بِشَيْءٍ عَذَّبَهُ اللَّهُ بِمَا قَتَلَ بِهِ نَفْسَهُ يَوْمَ الْقِيَامَةِ ‏"‏ ‏.‏ وَفِي الْبَابِ عَنْ أَبِي ذَرٍّ وَابْنِ عُمَرَ ‏.‏

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ ‏.‏

Classification

Sahih (Authentic)

References

• Jami` at-Tirmidhi, Vol. 5, Book of Faith, Hadith 2636
• Jami` at-Tirmidhi, Book of Faith, Hadith 2636