וּמִבָּנֶ֜יךָ אֲשֶׁ֨ר יֵצְא֧וּ מִמְּךָ֛ אֲשֶׁ֥ר תּוֹלִ֖יד יִקָּ֑חוּ וְהָיוּ֙ סָרִיסִ֔ים בְּהֵיכַ֖ל מֶ֥לֶךְ בָּבֶֽל׃
And of thy sons that shall issue from thee, whom thou shalt beget, shall they take away; and they shall be officers in the palace of the king of Babylon.’
Read halakhic rulings (Jewish law) on Isaiah 39:7: and classical halakhic sources.