Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said: "Whoever is killed unjustly, its burden will be upon the head of Adam's (peace be upon him) first son; he will be a partner in it, because he was the first to invent the way of killing."
Hadith Referenceمسند الحميدي / 118
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح ، وأخرجه البخاري 3335، 6867، 7321، ومسلم: 1677، وابن حبان فى ”صحيحه“ برقم: 5983، وأبو يعلى فى ”مسنده“ : برقم: 5179»