TT #271 · Parashas Shoftim · Sixth Aliyah · Passuk 19:21
And your eye shall not pity: life for life, eye for eye, tooth for tooth, hand for hand, foot for foot.
Torah Temimah points to Makkot 5b / Bava Kamma.
TT lemma: נֶפֶשׁ בְּנֶפֶשׁ.
Sefaria — Makkot 5b / Bava Kamma
English: ‘Life for life’ – and not life and an eye for life.
Derash on exact reciprocity (Bavli) — the measure is strictly corresponding.
The penalty imposed on the zomemim is exactly the measure they plotted: life for life, and not more.