וְאִם־שֵׁ֥ן עַבְדּ֛וֹ אֽוֹ־שֵׁ֥ן אֲמָת֖וֹ יַפִּ֑יל לַֽחָפְשִׁ֥י יְשַׁלְּחֶ֖נּוּ תַּ֥חַת שִׁנּֽוֹ׃ (פ)
И если он поразит своего раба'с зубом, или его раб'с зубом он отпустит его за зуб'ради
Mishnah Yevamot
If one has any kind of brother, [that brother] requires his brother’s wife to have yibbum, and he is his brother in every respect, except for a brother born from a female slave or a non-Jewish woman. If one has any kind of son, [that son] exempts his father’s wife from yibbum, and he is liable for striking or cursing [his father], and he is his son in every respect, except for the son of a female slave or a non-Jewish woman.