Abu Huraira reported God’s Messenger as saying, “If anyone helps in killing a believer to the extent of half a word,* he will meet God with ‘Despairing of God’s mercy’ written on his forehead.”
Ibn Majah transmitted it.
* This is taken to mean that it is a serious matter even to utter half the word which expresses an intention to kill a believer.
Jundub said he was told by so and so that God’s Messenger said, “On the day of resurrection the man who has been killed will bring the one who killed him and say, ‘Ask this man why he killed me,’ and he will say, ‘I killed him on account of so and so's property’.”* Jundub said, “Avoid that.”
Nasa’i transmitted it.
* There is some doubt as to whether the word is to be read milk or mulk. The translation above follows the former the latter is the correct reading it would require "in the time of so and so's reign." This, however, does not seem to suit the context.
Ibn ‘Umar reported the Prophet as saying, “If a man seizes a man and another kills him, the one who killed him is to be killed and the one who seized him is to be imprisoned.”
Sa'id b. al-Musayyib told that ‘Umar b. al-Khattab killed five or seven people for one man whom they had killed treacherously, ‘Umar saying. “If the people of San'a’ had conspired against him I would have killed them all.”
Malik transmitted it, and Bukhari transmitted something similar on the authority of Ibn ‘Umar.
