וְאַתָּה֙ תֶּאְזֹ֣ר מָתְנֶ֔יךָ וְקַמְתָּ֙ וְדִבַּרְתָּ֣ אֲלֵיהֶ֔ם אֵ֛ת כָּל־אֲשֶׁ֥ר אָנֹכִ֖י אֲצַוֶּ֑ךָּ אַל־תֵּחַת֙ מִפְּנֵיהֶ֔ם פֶּֽן־אֲחִתְּךָ֖ לִפְנֵיהֶֽם׃
至於你，你要束緊腰帶，起來，把我所吩咐你的一切話都告訴他們。不要因他們驚惶，免得我使你在他們面前驚惶。
Rashi
and the loins of kings I will loosen This is an expression of weakness and breaking strength, for girding the loins constitutes arming with strength. Comp. (Job 38:3) “Gird up your loins like a mighty man”; (Jer. 1:17) “And you gird up your loins”; (Job 12:21) “And the belt of the mighty He loosens”; an expression of breaking strength.