Ezekiel 21:28

"And thou, son of man, prophesy, and say, Thus saith the Lord concerning the children of Ammon, and concerning their reproach, and say thou, A sword, a sword is drawn, for the slaughter it is furbished, to cause it to devour, that it may be as lightning; while they see for thee false visions, while they divine lies unto thee, to lay thee upon the necks of the deadly wounded, whose day is come in the time of the iniquity of the end. Cause it to return unto its sheath. In the place where thou wast created, in the land of thy birth will I judge thee; I will blow upon thee with the fire of my wrath; and I will deliver thee into the hand of brutish men, skillful to destroy. Thou shalt be as fuel to the fire; thy blood shall be in the midst of the land; thou shalt be no more remembered: for I, Jehovah have spoken it."

This prophecy against Ammon has no promise of restoration.

We have no certain word on just why Ammon was singled out here for this special oracle; but it might have pertained to the share they had in the murder of Gedaliah, by the hand of Ishmael.