וּרְאִיתֶם֙ וְשָׂ֣שׂ לִבְּכֶ֔ם וְעַצְמוֹתֵיכֶ֖ם כַּדֶּ֣שֶׁא תִפְרַ֑חְנָה וְנוֹדְעָ֤ה יַד־יְהוָה֙ אֶת־עֲבָדָ֔יו וְזָעַ֖ם אֶת־אֹיְבָֽיו׃
און איר װעט זען, און אײַער האַרץ װעט זיך פֿרײען, און אײַערע בײנער װעלן װי גראָז בליִען; און די האַנט פֿון גאָט װעט דערװוּסט װערן בײַ זײַנע קנעכט, און ער װעט צערענען אױף זײַנע פֿײַנט.
Rashi
and the hand of the Lord shall be known When He wreaks His vengeance and His awesome acts, His servants shall know the strength of the might of His hand.
Ibn Ezra
Your heart The soul is meant, which has its principal seat in the heart.23Comp. I. E. on Gen. 1:1, where more instances of similar kinds of metonymy are given.
Ibn Ezra
And your bones. The principal constituents of the human frame.24The Hebrew text has the words כי הם המוסדות (lit., for they are the fundamental parts), which, on account of the plural form, cannot be meant as an explanation of לבבכם, but as that of עצמותיכם; the words רמז לגוף; the body is meant, must perhaps be supplied together with ועצמותיכם, for the phrase כי הם המוסרות contains the reason for some preceding explanation.