Exodus 36:36
He made four pillars of acacia for it, and overlaid them with gold. Their hooks were of gold. He cast four sockets of silver for them.
Jeremiah 1:18
For, behold, I have made you this day a fortified city, and an iron pillar, and bronze walls, against the whole land, against the kings of Judah, against its princes, against its priests, and against the people of the land.
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