Jeremiah 15:12

Shall iron break the northern iron and the steel?
] Can iron break iron, especially that which comes from the north, which was harder than the common iron; or steel, the hardest of all? though the Jews were hard as iron, they could not prevail against and overcome Jeremiah, who was made an iron pillar and brasen walls against them, ( Jeremiah 1:18 ) , and so these words are spoken for his comfort and encouragement: or they may respect the Jews and the Chaldeans; and the sense be, that the Jews, as mighty and as strong as they fancied themselves to be, and boasted that they were, they could not find themselves a match for the Chaldean army, which came out of the north; and may be said to be as hard as the northern iron, which came from the Chalybes, a people in the north, near Pontus, from whom steel has its name in the Latin tongue; and this sense agrees with what follows.