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:17199a –
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السيوطي:١٧١٩٩a –

"لِجَهَنَّمَ سَبْعَةُ أبْواب: بابٌ منْهَا لمَن سَلَّ السَّيفَ عَلَى أُمَّتي".  

[حم] أحمد [ت] الترمذي غريب، [طب] الطبرانى في الكبير عن ابن عمر

See similar narrations below:

Collected by Tirmidhī, Aḥmad
tirmidhi:3123 – ʿAbd b. Ḥumayd > ʿUthmān b. ʿUmar > Mālik b. Mighwal > Junayd > Ibn ʿUmar

that the Prophet ﷺ said: "There are seven gates of Jahannam: Among them a gate for whoever carries a sword against my Ummah." Or he said: "Against the Ummah of Muhammad."  

الترمذي:٣١٢٣ – حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ عَنْ مَالِكِ بْنِ مِغْوَلٍ عَنْ جُنَيْدٍ عَنِ ابْنِ عُمَرَ

عَنِ النَّبِيِّ ﷺ قَالَ لِجَهَنَّمَ سَبْعَةُ أَبْوَابٍ بَابٌ مِنْهَا لِمَنْ سَلَّ السَّيْفَ عَلَى أُمَّتِي أَوْ قَالَ عَلَى أُمَّةِ مُحَمَّدٍ ﷺ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ غَرِيبٌ لاَ نَعْرِفُهُ إِلاَّ مِنْ حَدِيثِ مَالِكِ بْنِ مِغْوَلٍ
ahmad:5689 – ʿUthmān b. ʿUmar > Mālik b. Mighwal > Junayd > Ibn ʿUmar

that the Prophet ﷺ said: "There are seven gates of Jahannam: Among them a gate for whoever carries a sword against my Ummah." Or he said: "Against the Ummah of Muhammad." (Using translation from Tirmidhī 3123)   

أحمد:٥٦٨٩ – حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ أَخْبَرَنَا مَالِكُ بْنُ مِغْوَلٍ عَنْ جُنَيْدٍ عَنِ ابْنِ عُمَرَ

أَنَّهُ سَمِعَ النَّبِيَّ ﷺ يَقُولُ لِجَهَنَّمَ سَبْعَةُ أَبْوَابٍ بَابٌ مِنْهَا لِمَنْ سَلَّ سَيْفَهُ عَلَى أُمَّتِي أَوْ قَالَ أُمَّةِ مُحَمَّدٍ