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.
Sahih al-Bukhari Book 87, Hadith 20
← Previous Hadith In the year of the Conquest of Mecca, the tribe of Khuza`a killed a man from the tribe of Bam Laith in revenge for a killed person belonging to them in the Pre-lslamic Period of Ignorance. So Allah's Apostle got up saying, "Allah held back the (army having) elephants from Mecca, but He let His Apostle and the believers overpower the infidels (of Mecca). Beware! (Mecca is a sanctuary)! Verily! Fighting in Mecca was not permitted for anybody before me, nor will it be permitted for anybody after me; It was permitted for me only for a while (an hour or so) of that day. No doubt! It is at this moment a sanctuary; its thorny shrubs should not be uprooted; its trees should not be cut down; and its Luqata (fallen things) should not be picked up except by the one who would look for its owner. And if somebody is killed, his closest relative has the right to choose one of two things, i.e., either the Blood money or retaliation by having the killer killed." Then a man from Yemen, called Abu Shah, stood up and said, "Write that) for me, O Allah's Messenger (ﷺ)!" Allah's Messenger (ﷺ) said (to his companions), "Write that for Abu Shah." Then another man from Quraish got up, saying, "O Allah's Messenger (ﷺ)! Except Al- Idhkhir (a special kind of grass) as we use it in our houses and for graves." Allah's Messenger (ﷺ) said, "Except Al-idhkkir."

Sahih al-Bukhari Book 87, Hadith 19 Next Hadith → 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."

Sahih al-Bukhari Book 87, Hadith 21