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.
nasai-kubra:8687ʿAmr b. ʿAlī > Yaḥyá > Ḥammād b. Salamah > ʿAbd al-Malik b. ʿUmayr > Rifāʿah b. Shaddād > ʿAmr b. al-Ḥamiq

[Machine] I heard the Messenger of Allah ﷺ saying: "Whoever believes in a person and then kills him, he will be given the flag of treachery on the Day of Resurrection."  

الكبرى للنسائي:٨٦٨٧أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنَا يَحْيَى قَالَ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ قَالَ حَدَّثَنَا عَبْدُ الْمَلِكِ بْنُ عُمَيْرٍ عَنْ رِفَاعَةَ بْنِ شَدَّادٍ عَنْ عَمْرِو بْنِ الْحَمِقِ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «مَنْ آمَنَ رَجُلًا عَلَى نَفْسِهِ ثُمَّ قَتَلَهُ أُعْطِيَ لِوَاءَ غَدْرٍ يَوْمَ الْقِيَامَةِ»