וְאַתָּה֙ תֶּאְזֹ֣ר מָתְנֶ֔יךָ וְקַמְתָּ֙ וְדִבַּרְתָּ֣ אֲלֵיהֶ֔ם אֵ֛ת כָּל־אֲשֶׁ֥ר אָנֹכִ֖י אֲצַוֶּ֑ךָּ אַל־תֵּחַת֙ מִפְּנֵיהֶ֔ם פֶּֽן־אֲחִתְּךָ֖ לִפְנֵיהֶֽם׃
Поэтому ты опоясываешь чресла твои, и встань, и скажи им все, что Я повелеваю тебе; не смущайся их, чтобы я не смутил тебя пред ними.
Tze'enah Ure'enah
“So you, gird up your loins, etc.” [1:17]. You Jeremiah, strongly gird up your loins, stand up and speak to them everything that I have commanded you. You should have no fear before them. That is to say, do not be afraid and you will believe that I can protect you. However, if you will be afraid, then I will make you fearful.
Rashi
And you shall gird your loins This is an expression of quickening like a man of valor.