יְלָדִ֣ים אֲשֶׁ֣ר אֵֽין־בָּהֶ֣ם כָּל־מאום [מוּם֩] וְטוֹבֵ֨י מַרְאֶ֜ה וּמַשְׂכִּילִ֣ים בְּכָל־חָכְמָ֗ה וְיֹ֤דְעֵי דַ֙עַת֙ וּמְבִינֵ֣י מַדָּ֔ע וַאֲשֶׁר֙ כֹּ֣חַ בָּהֶ֔ם לַעֲמֹ֖ד בְּהֵיכַ֣ל הַמֶּ֑לֶךְ וּֽלֲלַמְּדָ֥ם סֵ֖פֶר וּלְשׁ֥וֹן כַּשְׂדִּֽים׃
giovani senza alcun difetto, di bell'aspetto, esperti in ogni sapienza, dotati di conoscenza e perspicaci nel discernimento, capaci di prestare servizio nel palazzo del re; e che insegnasse loro la scrittura e la lingua dei Caldei.
Sichot HaRan
And he also does him a favor, when the Tzadik needs to go from level to level, then they try him, whether he has power to stand in the hall of the King (Daniel 1:4). And the hall of the King is the aspect of the mouth of the Tzadik which is called heikhal which is gematria Ad-nai which is the aspect of mouth, as is written, "malkhut -- peh/Kingship [is] the mouth."