al-Ḥakam b. Mūsá > Yaḥyá b. Ḥamzah > Sulaymān b. Dāwud > al-Zuhrī > Abū Bakr b. Muḥammad b. ʿAmr b. Ḥazm from his father from his grandfather

The Messenger of Allah ﷺ wrote to the people of Yemen and in his letter, he stated: "Whoever kills a believer without a just cause, his hands are to be tied, unless the relatives of the slain demand blood money." Abu Muhammad said: "Killing without a valid reason is considered murder." – Weak Chain

أَخْبَرَنَا الْحَكَمُ بْنُ مُوسَى حَدَّثَنَا يَحْيَى بْنُ حَمْزَةَ عَنْ سُلَيْمَانَ بْنِ دَاوُدَ حَدَّثَنِي الزُّهْرِيُّ عَنْ أَبِي بَكْرِ بْنِ مُحَمَّدِ بْنِ عَمْرِو بْنِ حَزْمٍ عَنْ أَبِيهِ عَنْ جَدِّهِ

أَنَّ رَسُولَ اللَّهِ ﷺ كَتَبَ إِلَى أَهْلِ الْيَمَنِ وَكَانَ فِي كِتَابِهِ «أَنَّ مَنْ اعْتَبَطَ مُؤْمِنًا قَتْلًا عَنْ بَيِّنَةٍ فَإِنَّهُ قَوَدُ يَدِهِ إِلَّا أَنْ يَرْضَى أَوْلِيَاءُ الْمَقْتُولِ» قَالَ أَبُو مُحَمَّد «اعْتَبَطَ قَتَلَ مِنْ غَيْرِ عِلَّةٍ» – إسناده ضعيف