Rashi on Exodus 21:24/רש"י על שמות כ״א:כ״ד

1עין תחת עין EYE FOR EYE — If one blinded the eye of his fellow-man he has to pay him the value of his eye, i. e. he pays him how much his value would be diminished if he were to be sold as a slave in the market. In the same way all other cases are to be dealt with, but it does not mean the actual cutting off of the offender’s limb — just as our Rabbis have explained in the chapter beginning with the word החובל (Bava Kamma 84a).