Matthew Poole and continuators on Isaiah 22:15

15 Thus saith the Lord GOD of hosts, Go, get thee unto this treasurer , even unto Shebna , which is over the house , and say,

Which the Prophet might boldly do, because he had the Protection not onely of God, who sent him upon this Errand, but probably of Hezekiah also, who at the time of this Prophecy was either King, or his Fathers Viceroy, or at least Heir-apparent to the Crown.

Who seems to have been advanced by wicked Ahaz, and to have been a great Patron of Impiety and Injustice in his Reign, and by politick Compliance with Hezekiah, thought to gain his Favour, and so to keep his Place and Power at Court.

Over the House of David, as is more fully expressed below, v. 22. Possibly he was not onely the Lord Treasurer, but also the Kings Prime Minister of State.