וַיֹּ֤אמֶר יְהוּדָה֙ לְאוֹנָ֔ן בֹּ֛א אֶל־אֵ֥שֶׁת אָחִ֖יךָ וְיַבֵּ֣ם אֹתָ֑הּ וְהָקֵ֥ם זֶ֖רַע לְאָחִֽיךָ׃
猶大對俄南說：「你去與你哥哥的妻子同房，向她盡夫兄弟的本分，為你哥哥立後裔。」
Deuteronomy
If brothers reside together, and one of them dies having no son, let the wife of the dead man not marry outside [the family] to a strange man; her brother-in-law will consummate with her thus marrying her to be his wife, and perform levirate marriage with her.