ישעיהו ס:טז פירוש: רש״י ואבן עזרא

and the breast of kings Heb. וְשֹׁד, an expression of breasts (שָׁדַיִם) and ‘you shall suck’ proves it.

The milk of nations. Their money; they will pay tribute.

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.