Exodus 21:26

את עין עבדו [AND IF A MAN SMITE] THE EYE OF HIS SERVANT — of a Canaanitish servant; but the Hebrew servant does not got free on account of his tooth or his eye having been knocked out by his master, as we have stated in our comment on the passage לא תצא כצאת העבדים (v. 7). תחת עינו [HE SHALL LET HIM GO FREE] FOR HIS EYE’S SAKE — and similarly if he cuts off one of the twenty-four “tips of limbs” viz., the fingers, the toes, the two ears, the nose and the ראש הגויה, the membrum (cf. Mishnah Negaim 6:7). But why, since the precept is not applicable to eye and tooth alone but to twenty-four limbs, are both the eye and the tooth, mentioned? One would have stufficed! Because if only the eye were mentioned and not the tooth also, I might have said: What it the characteristic of the eye? It came into the world together with him! So, too, this law is applicable only to such limbs as came into the world together with him, but not to the tooth, for the tooth did not come into the world together with him. If, on the other hand, only the tooth had been mentioned and not the eye also, I might have said: the law applies even to a case when the master knocked out a child-slave’s tooth which grows again (more lit., which has a substitute) after a time. Therefore the eye is also mentioned to intimate that the law can be applied only when the master knocks out the tooth of his adult slave which, like the eye, does not grow again. (Kiddushin 24b).

וְכִֽי־יַכֶּ֨ה אִ֜ישׁ אֶת־עֵ֥ין עַבְדּ֛וֹ אֽוֹ־אֶת־עֵ֥ין אֲמָת֖וֹ וְשִֽׁחֲתָ֑הּ לַֽחׇפְשִׁ֥י יְשַׁלְּחֶ֖נּוּ תַּ֥חַת עֵינֽוֹ׃

And if a man smite the eye of his servant, or the eye of his maid, and destroy it; he shall let him go free for his eye’s sake.