Sunan an-Nasa'i 4752
سنن النسائي#4752Sahihأَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا أَبُو خَالِدٍ، سُلَيْمَانُ بْنُ حَيَّانَ قَالَ حَدَّثَنَا حُمَيْدٌ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَضَى بِالْقِصَاصِ فِي السِّنِّ وَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " كِتَابُ اللَّهِ الْقِصَاصُ " .
It was narrated from Anas that:the Messenger of Allah ruled that Qisas should be given for a tooth. The Messenger of Allah said: "The Messenger of Allah said: "What Allah has decreed is retaliation
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 45:47