Charles Ellicott Commentary Jeremiah 28:6

"even the prophet Jeremiah said, Amen: Jehovah do so; Jehovah perform thy words which thou hast prophesied, to bring again the vessels of Jehovah`s house, and all them of the captivity, from Babylon unto this place." — Jeremiah 28:6 (ASV)

Amen, the Lord do so. —It is impossible to mistake the tone of keen, incisive irony with which the words were spoken. The speaker could, without falsehood, echo the wish as far as it was a wish, but he knew that it was a wish for the impossible. The whole condition of things would have to be altered before there could be the slightest prospect of its fulfilment. It was not wise to pray for what was obviously out of the lines of God’s normal methods of working in history, and against His purpose, as uttered by His prophets.