Thou profane, etc... He speaks to king Sedecias, who had broken his oath, and was otherwise a wicked prince.
21:26. Thus saith the Lord God: Remove the diadem, take off the crown: is it not this that hath exalted the low one, and brought down him that was high?
Is it not this that hath exalted the low one... The royal crown of Juda had exalted Sedecias from a private state and condition to the sovereign power, as the loss of it had brought down Jechonias, etc.
21:27. I will shew it to be iniquity, iniquity, iniquity: but this was not done till he came to whom judgment belongeth, and I will give it him.
I will shew it to be iniquity, etc... Or, I will overturn it, viz., the crown of Juda for the manifold iniquities of the kings: but it shall not be utterly removed, till Christ come whose right it is: and who shall reign in the spiritual house of Jacob, that is, in his church, for evermore.
21:28. And thou son of man, prophesy, and say: Thus saith the Lord God concerning the children of Ammon, and concerning their reproach, and thou shalt say: O sword, O sword, come out of the scabbard to kill, be furbished to destroy, and to glitter,
Concerning their reproach... By which they had reproached and insulted over the Jews, at the time of the destruction of Jerusalem.
21:29. Whilst they see vain things in thy regard, and they divine lies: to bring thee upon the necks of the wicked that are wounded, whose appointed day is come in the time of iniquity.
21:30. Return into thy sheath. I will judge thee in the place wherein thou wast created, in the land of thy nativity.
Return into thy sheath, etc... The sword of Babylon, after raging against many nations, was shortly to be judged and destroyed at home by the Medes and Persians.