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
ahmad:6662 – Ḥusayn b. Muḥammad And Hāshim / Ibn al-Qāsim > Muḥammad b. Rāshid al-Khuzāʿī > Sulaymān b. Mūsá > ʿAmr b. Shuʿayb from his father from his grandfather

[Machine] That the Prophet ﷺ ruled that a Muslim should not be killed by a non-believer.  

أحمد:٦٦٦٢ – حَدَّثَنَا حُسَيْنُ بْنُ مُحَمَّدٍ وَهَاشِمٌ يَعْنِي ابْنَ الْقَاسِمِ قَالَا حَدَّثَنَا مُحَمَّدُ بْنُ رَاشِدٍ الْخُزَاعِيُّ عَنْ سُلَيْمَانَ بْنِ مُوسَى عَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ

أَنَّ النَّبِيَّ ﷺ قَضَى أَنْ لَا يُقْتَلَ مُسْلِمٌ بِكَافِرٍ  

See similar narrations below:

Collected by Ibn Mājah, Suyūṭī
ibnmajah:2659 – Hishām b. ʿAmmār > Ḥātim b. Ismāʿīl > ʿAbd al-Raḥman b. ʿAyyāsh > ʿAmr b. Shuʿayb from his father from his grandfather

“A Muslim should not be killed in retaliation for the murder of a disbeliever.”  

ابن ماجة:٢٦٥٩ – حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ عَيَّاشٍ عَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يُقْتَلُ مُسْلِمٌ بِكَافِرٍ