'Pillar' in the Bible

in case I am delayed, so that you will know how people ought to conduct themselves in the household of God, which is the church of the living God, the pillar and foundation of the truth.

He who overcomes [the world through believing that Jesus is the Son of God], I will make him a pillar in the temple of My God; he will most certainly never be put out of it, and I will write on him the name of My God, and the name of the city of My God, the new Jerusalem, which descends out of heaven from My God, and My [own] new name.