John Calvin's Bible Commentary
Jeremiah 34:21
He repeats almost the same words, but yet he comes closer to the subject, for he names the enemies of whom he had spoken indefinitely before. He had indeed said that they would be cruel, and would seek their death, and would not be otherwise satisfied. He repeats again the same for the sake of confirmation; but he afterwards adds, that these enemies would be the soldiers of the king of Babylon, even the Chaldeans. He then shews, as by the finger, to the Jews, their calamity, lest they should, as usual, indulge themselves with the hope of security. He does not then declare generally, that they would be punished, and that enemies would come cruelly to destroy them; but he points out the army of the king of Babylon, and says that the Chaldeans would come, being armed by God and fighting under his banner, and would take the city, and destroy the whole kingdom.
But as the Chaldeans had departed, the confidence and the security of the Jews had increased, for they thought that they were now freed from danger. The cause of this departure was, that the Egyptians had gathered an army to help the Jews, or rather to provide by anticipation, for their own safety. There was an alliance, we know, at that time between the Jews and the Egyptians; and the object of both was to fortify themselves against the king of Babylon. The Egyptians had no great care for the Jews, but another reason influenced them; for it was well known, that as soon as the Chaldeans finished the Jewish war, they would make an attack on Egypt. Now they thought that it would be an advantage to them to engage with the Babylonian army in connection with the Jews; for they would have had to fight alone, had Nebuchadnezzar gained the victory; nay, the Jews themselves would have been compelled to assist in subduing Egypt. Hence the Egyptians, having well weighed these things, gathered a large army. The Babylonians, having heard the report, went forth to meet them. Thus the siege of the city was left. The Jews exulted as though they had escaped all danger. Hence the Prophet derides their folly in thinking that they would now be in peace and quietness, because the Chaldeans had gone up from them, because they left for a time the city, and went up towards Egypt. Though then, he says, (the particle is to be taken adversatively) they have ascended from you, yet God will deliver you into into their hand.
We now see that Jeremiah spared neither the king nor the princes; and thus we ought to notice the power of the Holy Spirit, which prevailed in the hearts of the Prophets, for they boldly addressed, not only the common people, but also kings and princes. As then we find the Prophet denouncing, with so much courage, the judgment of God on the king and the chief men, let us know, that none are fit to bear rule in the Church, except they be endued with so much firmness as not to fear any, and not to be disheartened by the power of any, so as not to reprove boldly the highest as well as the lowest. It follows —