וְכִֽי־יַכֶּ֨ה אִ֜ישׁ אֶת־עֵ֥ין עַבְדּ֛וֹ אֽוֹ־אֶת־עֵ֥ין אֲמָת֖וֹ וְשִֽׁחֲתָ֑הּ לַֽחָפְשִׁ֥י יְשַׁלְּחֶ֖נּוּ תַּ֥חַת עֵינֽוֹ׃ (ס)
And if a man smite the eye of his bondman, or the eye of his bondwoman, and destroy it, he shall let him go free for his eye’s sake.
Read Jewish philosophical commentary on Exodus 21:26: and classical philosophical sources.