Ibn Ezra on Isaiah
כהני The priests. I said already that the meaning of כהן is, one that ministers; it is therefore qualified here by the genitive of our God. The other nations will resemble the Israelites, and the Israelites will be like the Aaronites; the Israelites will therefore receive the abundance of nations as their tithes.
Rashi on Isaiah
the possessions of the nations Heb. חֵיל גּוֹיִם, the possessions of the nations [after Jonathan].