John Calvin's Bible Commentary
Jeremiah 27:21
He repeats again the same words, Yea, thus saith Jehovah, etc.; for so ought the particle כי, ki, to be rendered in this place. (191) And he emphatically expresses what was of itself sufficiently clear, that he might deeply imprint on their minds this declaration of God, and that thus some terror might penetrate into the hearts of those who were so obdurate that it was not easy to effect anything by a simple statement of the truth. Thus, then, saith Jehovah of the vessels which yet remain in the Temple of Jehovah and in, the palace of the king, They shall be carried to Babylon, and there they shall be, etc. Jeremiah intimates that the Jews had no hope, as they were perversely resisting God and refusing to be chastised by his hand. And he says, until the day in which I shall visit them, the vessels; for so the reference may suitably be made; but as it is often the case in Hebrew to put a pronoun when anything remarkable is spoken without any noun, or a subject, as they say, preceding it, I am inclined to refer it to the Jews themselves; for the restoration of the vessels depended on that of the people. He means, then, that the vessels would be held captive until God allowed a free return to the people, which happened through the edict of Cyrus, after he had obtained power in Chaldea and Assyria.
It was the same thing as though the Jews were reminded that the exile which had been predicted would be long, and that they foolishly hoped for what the false prophets had promised as to the vessels; for God had no greater care for the vessels than for his chosen people, as the vessels were acceptable to God for the people’s sake. Here, then, Jeremiah confirms what he has said elsewhere, and that often, that the people would be captives until the day of visitation, that is, till the end of seventy years. When, therefore, says God, I shall visit the Jews themselves, I will then bring back also the vessels; and so it was permitted by the command of Cyrus. We now understand the simple meaning of the words. Another narrative follows, —