וְשַׂ֣ר ׀ מַלְכ֣וּת פָּרַ֗ס עֹמֵ֤ד לְנֶגְדִּי֙ עֶשְׂרִ֣ים וְאֶחָ֣ד י֔וֹם וְהִנֵּ֣ה מִֽיכָאֵ֗ל אַחַ֛ד הַשָּׂרִ֥ים הָרִאשֹׁנִ֖ים בָּ֣א לְעָזְרֵ֑נִי וַאֲנִי֙ נוֹתַ֣רְתִּי שָׁ֔ם אֵ֖צֶל מַלְכֵ֥י פָרָֽס׃
그런데 바사국 군이 이십일 일 동안 나를 막았으므로 내가 거기 바사국 왕들과 함께 머물러 있더니 군장 중 하나 미가엘이 와서 나를 도와주므로
Rashi
has been standing against me to battle with me in heaven by requesting an extension for the kingdom for Persia to enable them to subjugate you (Israel). Behold twenty-one days that he has been standing against me.