Jeremiah 28:6

Even the prophet Jeremiah said, Amen: the LORD do so: the LORD perform thy words which thou hast prophesied, to bring again the vessels of the LORD’s house, and all that is carried away captive, from Babylon into this place.

The verse belongs to the controversy between true and false prophets over the Babylonian captivity and the promised return of the exiles. In it Jeremiah is answering Hananiah, a false prophet who promised prosperity and the return of the temple vessels and the captives, who reassured the people and opposed Jeremiah's warnings, and who thereby encouraged resistance to God's counsel. By his amen Jeremiah sincerely expressed the wish that Hananiah's promise would come true, that the Lord would bring back the vessels of the Lord's house and all carried away captive from Babylon into this place. That wishful agreement did not mean Hananiah's prophecy was true and did not endorse it. Jeremiah knew the promised return and deliverance could happen only if the people repented and obeyed God, and without repentance it would not occur. The people were to submit to Babylon for the time God had set, and Jeremiah urged them to accept that specified period of submission.