וְאִם־שֵׁ֥ן עַבְדּ֛וֹ אֽוֹ־שֵׁ֥ן אֲמָת֖וֹ יַפִּ֑יל לַֽחָפְשִׁ֥י יְשַׁלְּחֶ֖נּוּ תַּ֥חַת שִׁנּֽוֹ׃ (פ)
און אַז ער װעט אױסהאַקן אַ צאָן פֿון זײַן קנעכט, אָדער אַ צאָן פֿון זײַן דינסט, זאָל ער אים אַרױסלאָזן פֿרײַ פֿאַר זײַן צאָן.
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.