TT #273 · 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 Sifrei Devarim 190 / Makkos.
TT lemma: וְלֹא תָחוֹס עֵינֶךָ.
Sefaria — Sifrei Devarim 190 / Makkos
English: ‘And your eye shall not pity’ – that you not find grounds to acquit him.
Derash against misplaced pity (Sifrei) — the court must not spare the conspiring witnesses.
The court must not pity the malicious witnesses; the full measure of their plot is applied so that the evil is purged.