וְאִם־אָס֖וֹן יִהְיֶ֑ה וְנָתַתָּ֥ה נֶ֖פֶשׁ תַּ֥חַת נָֽפֶשׁ׃
But if any harm follow, then thou shalt give life for life,
Read Jewish philosophy on Exodus 21:23: Rambam's Guide for the Perplexed, Saadia Gaon, and classical Jewish philosophical sources, free online.