'Pillars' in the Bible

and having known the grace that was given to me, James, and Cephas, and John, who were esteemed to be pillars, a right hand of fellowship they did give to me, and to Barnabas, that we to the nations, and they to the circumcision may go,

And I saw another strong messenger coming down out of the heaven, arrayed with a cloud, and a rainbow upon the head, and his face as the sun, and his feet as pillars of fire,