Charles Ellicott Commentary Leviticus 24:19-20

"And if a man cause a blemish in his neighbor; as he hath done, so shall it be done to him: breach for breach, eye for eye, tooth for tooth; as he hath caused a blemish in a man, so shall it be rendered unto him." — Leviticus 24:19-20 (ASV)

And if a man cause a blemish. — See Exodus 21:24-25.