"O you who believe! Al- Qisas (the Law of Equality in punishment) is prescribed for you..." (V.2:178)
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ الأَنْصَارِيُّ، حَدَّثَنَا حُمَيْدٌ، أَنَّ أَنَسًا، حَدَّثَهُمْ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " كِتَابُ اللَّهِ الْقِصَاصُ ".
Narrated Anas: The Prophet (ﷺ) said, "The prescribed Law of Allah is the equality in punishment (i.e. Al-Qisas)." (In cases of murders, etc.)