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:4617a –
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السيوطي:٤٦١٧a –

"إِن اللهَ أَبَى عَليَّ فيمن قَتَلَ مُؤمِنًا - ثلاثًا".  

[حم] أحمد [ن] النسائي [طب] الطبرانى في الكبير [ك] الحاكم في المستدرك [ق] البيهقى في السنن عن عقبة بن مالك الليثى

See similar narrations below:

Collected by Bayhaqī
bayhaqi:15863 – Abū al-Ḥusayn Muḥammad b. al-Ḥusayn b. Muḥammad b. al-Faḍl al-Qaṭṭān> ʿAbdullāh b. Jaʿfar b. Durustawayh > Yaʿqūb b. Sufyān > ʿAmr b. ʿĀṣim > Sulaymān b. al-Mughīrah > Ḥumayd b. Hilāl > Naṣr b. ʿĀṣim al-Laythī > ʿUqbah b. Mālik al-Laythī

[Machine] The Messenger of Allah ﷺ said: "Verily, Allah has forbidden me from pardoning the one who kills a believer." He repeated this statement three times.  

البيهقي:١٥٨٦٣ – أَخْبَرَنَا أَبُو الْحُسَيْنِ مُحَمَّدُ بْنُ الْحُسَيْنِ بْنِ مُحَمَّدِ بْنِ الْفَضْلِ الْقَطَّانُ بِبَغْدَادَ أنبأ عَبْدُ اللهِ بْنُ جَعْفَرِ بْنِ دُرُسْتَوَيْهِ ثنا يَعْقُوبُ بْنُ سُفْيَانَ ثنا عَمْرُو بْنُ عَاصِمٍ ثنا سُلَيْمَانُ بْنُ الْمُغِيرَةِ ثنا حُمَيْدُ بْنُ هِلَالٍ عَنْ نَصْرِ بْنِ عَاصِمٍ اللَّيْثِيِّ عَنْ عُقْبَةَ بْنِ مَالِكٍ اللَّيْثِيِّ قَالَ

قَالَ رَسُولُ اللهِ ﷺ إِنَّ اللهَ ﷻ أَبَى عَلَيَّ لِمَنْ قَتَلَ مُؤْمِنًا قَالَهَا ثَلَاثًا