Jewish Philosophy on Isaiah 1:25: Rambam & Classical Sources

וְאָשִׁ֤יבָה יָדִי֙ עָלַ֔יִךְ וְאֶצְרֹ֥ף כַּבֹּ֖ר סִיגָ֑יִךְ וְאָסִ֖ירָה כָּל־בְּדִילָֽיִךְ׃

And I will turn My hand upon thee, And purge away thy dross as with lye, And will take away all thine alloy;