Deuteronomy 19:13

19:13 You must not pity him, but purge out the blood of the innocent from Israel, so that it may go well with you.

Deuteronomy 19:21

19:21 You must not show pity; the principle will be a life for a life, an eye for an eye, a tooth for a tooth, a hand for a hand, and a foot for a foot.