R. Eliezer, the son of R. Yossi Haglili says: Whence is it derived that every one of Israel will have sons like those who left Egypt? From (Psalms 45:17) "In place of your fathers will be your sons." If "sons," I might think (even) the sick and the humble. It is, therefore, written (Ibid.) "You will make the princes." If "princes," I might think merchants. It is, therefore, written (here) "a kingdom." If a king, I might think that he reverts to being a conqueror. It is, therefore, written "Cohanim," "idlers" (from war), as in (II Samuel 8:18) "And the sons of David were Cohanim."