וְיָנַקְתְּ֙ חֲלֵ֣ב גּוֹיִ֔ם וְשֹׁ֥ד מְלָכִ֖ים תִּינָ֑קִי וְיָדַ֗עַתְּ כִּ֣י אֲנִ֤י יְהוָה֙ מֽוֹשִׁיעֵ֔ךְ וְגֹאֲלֵ֖ךְ אֲבִ֥יר יַעֲקֹֽב׃
Y mamarás la leche de las gentes, el pecho de los reyes mamarás; y conocerás que yo SEÑOR soy el Salvador tuyo, y Redentor tuyo, el Fuerte de Jacob.
Rashi on Isaiah
and the breast of kings Heb. וְשֹׁד, an expression of breasts (שָׁדַיִם) and ‘you shall suck’ proves it.
Ibn Ezra on Isaiah
The milk of nations. Their money; they will pay tribute.
Ibn Ezra on Isaiah
שד Breast. It is the same as שָׁדַיִם. The form of the nouns is not constant.16The two forms referred to are שֹׁד and שֵׁד. Comp. I. E. on c. 9:3, and Note 4.