Sahih al-Bukhari Book 87, Hadith 21
The Prophet (ﷺ) said, "The most hated persons to Allah are three: (1) A person who deviates from the
right conduct, i.e., an evil doer, in the Haram (sanctuaries of Mecca and Medina); (2) a person who
seeks that the traditions of the Pre-lslamic Period of Ignorance, should remain in Islam (3) and a
person who seeks to shed somebody's blood without any right."
For the children of Israel the punishment for crime was Al-Qisas only (i.e., the law of equality in punishment) and the payment of Blood money was not permitted as an alternate. But Allah said to this nation (Muslims): 'O you who believe! Qisas is prescribed for you in case of murder, .....(up to) ...end of the Verse. (2.178) Ibn `Abbas added: Remission (forgiveness) in this Verse, means to accept the Blood-money in an intentional murder. Ibn `Abbas added: The Verse: 'Then the relatives should demand Blood-money in a reasonable manner.' (2.178) means that the demand should be reasonable and it is to be compensated with handsome gratitude.
The pagans were defeated on the day (of the battle) of Uhud. Satan shouted among the people on the day of Uhud, "O Allah's worshippers! Beware of what is behind you!" So the front file of the army attacked the back files (mistaking them for the enemy) till they killed Al-Yaman. Hudhaifa (bin Al- Yaman) shouted, "My father!" My father! But they killed him. Hudhaifa said, "May Allah forgive you." (The narrator added: Some of the defeated pagans fled till they reached Taif.)