We had prescribed this decree in the Torah for the Jews: "Life for life, eye for eye, nose for nose, ear for ear, tooth for tooth, and for all wounds equal retaliation."74 However, whoever forgoes retaliation as charity, it shall be expiation for him:75 those, who do not judge by the Law which Allah has sent down, are indeed the unjust people.
74Compare this with Exodus, 21 : 23-27.
75It implies that if one forgoes retaliation with the intention of doing a good turn, this good act will atone for many of his sins. The Holy Prophet explained this, saying, "If one receives a wound in one's body and forgoes its retaliation, then one's sins will be forgiven in proportion to the degree of forgiveness."