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:6221a –
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السيوطي:٦٢٢١a –

"إِنَّ أَعْدى الناسِ على اللَّهِ مَنْ قَتَلَ في الحَرَمِ، أَو قَتل غير قاتِلِهِ، أَو قَتَل بِذُحُول الْجَاهِلِيَّةَ".  

[حم] أحمد عن ابن عمرو

See similar narrations below:

Collected by Aḥmad, Suyūṭī
ahmad:6757 – Abū Kāmil > Ḥammād / Ibn Salamah > Ḥabīb al-Muʿallim > ʿAmr b. Shuʿayb from his father from his grandfather

[Machine] The Messenger of Allah ﷺ said: "Indeed, the most aggressive among people towards Allah, the Mighty and Sublime, is he who kills within the sacred precincts of Allah, or kills someone other than a killer, or kills through the methods of pre-Islamic ignorance."  

أحمد:٦٧٥٧ – حَدَّثَنَا أَبُو كَامِلٍ حَدَّثَنَا حَمَّادٌ يَعْنِي ابْنَ سَلَمَةَ أَخْبَرَنِي حَبِيبٌ الْمُعَلِّمُ عَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ

قَالَ رَسُولُ اللهِ ﷺ إِنَّ أَعْتَى النَّاسِ عَلَى اللهِ ﷻ مَنْ قَتَلَ فِي حَرَمِ اللهِ أَوْ قَتَلَ غَيْرَ قَاتِلِهِ أَوْ قَتَلَ بِذُحُولِ الْجَاهِلِيَّةِ  

suyuti:7196a –
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السيوطي:٧١٩٦a –

"إِنَّ من أَعْتَى النَّاسِ على اللَّه ثلَاثَةً، رَجُلٌ قَتَلَ غيرَ قاتله، أَو قَتَلَ بِذَحَلِ الجَاهِليَّةِ، أَو قَتل في حَرَم اللَّه "  

ابن جرير عن قتادة مرسلًا