John Trapp on Isaiah 57:9

Ver. 9. And thou wenteſt to the King] The King of Aſſyria, who ſtiled himſelf the great King, to whom Ahaz both ſent and went, 2 King. 16.8, 10.

With ointment] Heb. with oyle, that is, with balſam, ſuch as Judea only afforded, and was therefore highly eſteemed in other countries.

And didſt debaſe thy ſelf even unto hell] By crouching and cringing to thoſe forraign ſtates, in a moſt ſubmiſſe and ſervile way, as Ahaz had done with his, I am thy ſervant and thy ſon, 2 King. 16.7. to the diſhonour of God, and to the reproach of Iſrael, who was Gods firſt-born, higher than the Kings of the earth, Pſal. 89.27.