Powtórzonego Prawa 19:13 Halacha: Mishneh Torah, One Who Injures a Person or Property, Mishneh Torah, Negative Mitzvot & Sefer HaChinukh

And so [too], that which it states about one who injures his fellow and causes him damage, "Your eye should not pity;" is [to mean] that you should not pity [him] concerning payments, lest you will say, "This one is a poor person and he injured him unintentionally, [so] I will have mercy on him." Hence, it states, "Your eye should not pity."

Not to spare the offender, in imposing the prescribed penalties on one who has caused damage, as it is said, “Thine eye shall not pity him” (Deut. 19:13).

To not show pity upon the killer or injurer: That we were prevented from having mercy upon the one that killed his fellow or removed one of his limbs; that the judge not say, “This poor man that cut off the hand of his fellow or blinded his eye, he did not do it intentionally,” and he have mercy upon him from having him repay [the injured] according to his evil. And about this is it stated (Deuteronomy 19:21), “And your eye shall not show mercy, a soul for a soul, etc.” And the prevention of this is repeated in a different place, as it is stated (Deuteronomy 19:13), “Your eye shall not show mercy upon him, and you shall purge the innocent blood.”