וְאִם־שֵׁ֥ן עַבְדּ֛וֹ אֽוֹ־שֵׁ֥ן אֲמָת֖וֹ יַפִּ֑יל לַֽחָפְשִׁ֥י יְשַׁלְּחֶ֖נּוּ תַּ֥חַת שִׁנּֽוֹ׃ (פ)
And if he smite out his bondman’s tooth, or his bondwoman’s tooth, he shall let him go free for his tooth’s sake.
Read Jewish philosophical commentary on Exodus 21:27: and classical philosophical sources.