Jeremiah 1:18
For, behold, I have made you this day a defended city, and an iron pillar, and brazen walls against the whole land, against the kings of Judah, against the princes thereof, against the priests thereof, and against the people of the land.
Torrey's Topical Textbook—AKJV

Galatians 2:9
And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given to me, they gave to me and Barnabas the right hands of fellowship; that we should go to the heathen, and they to the circumcision.
Torrey's Topical Textbook—AKJV