| Barnes' Notes on the Bible The second warning is utter sterility of the soil. Compare Deuteronomy 11:17; Deuteronomy 28:18; Ezekiel 33:28; Ezekiel 36:34-35.
Gill's Exposition of the Entire BibleAnd I will break the pride of your power,.... Which the Targum of Jonathan and Jarchi interpret of the sanctuary, which they were proud of, trusted in, and boasted of; but was broke or destroyed, first by Nebuchadnezzar, then by the Romans: but it may rather signify their country, the glory of all lands for its fruitfulness, which for their sins should become barren, as follows; or the multitude of their forces, and the strength of their mighty men of war, in which they put their confidence; it may take in everything, civil and ecclesiastical, they prided themselves with, and had their dependence on, thinking themselves safe on account of them, but should be broken to shivers, and be of no service to them: and I will make your heaven as iron; so that neither dew nor rain shall descend from thence to make the earth fruitful; but, on the contrary, an heat should be reflected, which would parch it, and make it barren: and your earth as brass; that the seed could not be cast into it, nor anything spring out of it, for the service of man and beast, so that a famine must unavoidably follow.
Geneva Study BibleAnd I will break the pride of your power; and I will make your heaven as {i} iron, and your earth as brass: (i) You shall have drought and barrenness.
Wesley's Notes 26:19 The pride of your power - That is, your strength of which you are proud, your numerous and united forces, your kingdom, yea, your ark and sanctuary. I will make your heaven as iron - The heavens shall yield you no rain, nor the earth fruits.
Jamieson-Fausset-Brown Bible Commentary19. I will make your heaven as iron, and your earth as brass-No figures could have been employed to convey a better idea of severe and long-continued famine.
Matthew Henry's Concise Commentary26:14-39 After God has set the blessing before them which would make them a happy people if they would be obedient, he here sets the curse before them, the evils which would make them miserable, if they were disobedient. Two things would bring ruin. 1. A contempt of God's commandments. They that reject the precept, will come at last to renounce the covenant. 2. A contempt of his corrections. If they will not learn obedience by the things they suffer, God himself would be against them; and this is the root and cause of all their misery. And also, The whole creation would be at war with them. All God's sore judgments would be sent against them. The threatenings here are very particular, they were prophecies, and He that foresaw all their rebellions, knew they would prove so. TEMPORAL judgments are threatened. Those who will not be parted from their sins by the commands of God, shall be parted from them by judgments. Those wedded to their lusts, will have enough of them. SPIRITUAL judgments are threatened, which should seize the mind. They should find no acceptance with God. A guilty conscience would be their continual terror. It is righteous with God to leave those to despair of pardon, who presume to sin; and it is owing to free grace, if we are not left to pine away in the iniquity we were born in, and have lived in. | 
