Al-Maaida 5:45

We ordained for them therein, “A life for a life, an eye for an eye, a nose for a nose, an ear for an ear, a tooth for a tooth, and for wounds equal retaliation[42].” But if anyone waives it charitably, then it will be an expiation for him[43]. Whoever does not judge according to what Allah has revealed, it is they who are the wrongdoers.

[42] This verse alludes to the law known as "lex talionis" (law of retaliation/reciprocal justice) which states that justice should be carried out: ‘ayin tachat ‘ayin, “an eye for an eye”, as told in the Torah (Exodus 21: 24) but which was distorted from its proper, fully-known position. The Qur’an re-establishes this principle.
[43] Forgiveness is not only encouraged by Allah but is also rewarded for.

And We ordained for them therein a life for a life, an eye for an eye, a nose for a nose, an ear for an ear, a tooth for a tooth, and for wounds is legal retribution. But whoever gives [up his right as] charity, it is an expiation for him. And whoever does not judge by what Allāh has revealed - then it is those who are the wrongdoers [i.e., the unjust].

45. And We ordained therein for them: "Life for life,[14] eye for eye, nose for nose, ear for ear, tooth for tooth, and wounds equal for equal." But if anyone remits the retaliation by way of charity, it shall be for him an expiation. And whosoever does not judge by that which Allâh has revealed, such are the Zâlimûn (polytheists and wrong-doers - of a lesser degree).

[14] (V.5:45) Narrated ‘Abdullâh رضي الله عنه: Allâh’s Messenger صلى الله عليه وسلم said, "The blood of a Muslim who confesses that Lâ ilaha illallâh (none has the right to be worshipped but Allâh) and that I am the Messenger of Allâh, cannot be shed except in three cases.
1) Life for life in case of intentional murder without right [i.e. in Qisâs (Law of Equality in punishment)],
2) A married person who commits illegal sexual intercourse, and
3) The one who reverts from Islâm (apostates) and leaves the group of Muslims (by innovating heresy, new ideas, new things in the Islâmic Religion). (See Fath Al-Bari Vol. 15, page No.220, for details). (Sahih Al-Bukhâri, Vol.9, Hadîth No.17).

And We prescribed for them therein: The life for the life, and the eye for the eye, and the nose for the nose, and the ear for the ear, and the tooth for the tooth, and for wounds retaliation. But whoso forgoeth it (in the way of charity) it shall be expiation for him. Whoso judgeth not by that which Allah hath revealed: such are wrong-doers.