וּבְנֵ֣י הַנֵּכָ֗ר הַנִּלְוִ֤ים עַל־יְהוָה֙ לְשָׁ֣רְת֔וֹ וּֽלְאַהֲבָה֙ אֶת־שֵׁ֣ם יְהוָ֔ה לִהְי֥וֹת ל֖וֹ לַעֲבָדִ֑ים כָּל־שֹׁמֵ֤ר שַׁבָּת֙ מֵֽחַלְּל֔וֹ וּמַחֲזִיקִ֖ים בִּבְרִיתִֽי׃
Y á los hijos de los extranjeros que se allegaren á SEÑOR para ministrarle, y que amaren el nombre de SEÑOR para ser sus siervos: á todos los que guardaren el sábado de profanarlo, y abrazaren mi pacto,
Ibn Ezra on Isaiah
Also the sons of the stranger, etc. The eunuchs are mentioned before the sons of the strangers, because they are the last named (ver. 3). Comp. And I gave to Isaac, Jacob, and Esau, and I gave to Esau, etc. (Jos. 24:4).
Ibn Ezra on Isaiah
To serve him. The service of the Lord consists in keeping His commandments.