Rashi on Isaiah
shall the peg...move (This alludes to) the greatness of Shebna.
Ibn Ezra on Isaiah
The nail, etc. Shebna, who thought himself a nail fixed in a strong place.
Rashi on Isaiah
and the burden which is upon it shall be cut off His family members and his company who depend on him and who hang upon him the vessels of their glory. And since he likened him to a peg, he likened those who boast about him and rely on him, to a burden loaded on the peg. Some interpret it: And the prophecy prophesied about him shall be fulfilled.