Jeremiah 1:18

1:18 I, the Lord, hereby promise to make you as strong as a fortified city, an iron pillar, and a bronze wall. You will be able to stand up against all who live in the land, including the kings of Judah, its officials, its priests and all the people of the land.

Jeremiah 52:20

52:20 The bronze of the items that King Solomon made for the Lord’s temple (including the two pillars, the large bronze basin called “The Sea,” the twelve bronze bulls under “The Sea,” and the movable stands) was too heavy to be weighed.