The wall of the City had twelve foundation stones, on which were the twelve names of the twelve Apostles of the Lamb.

The foundations of the wall of the City were ornamented with every kind of precious stone. The first foundation stone was a jasper; the second a sapphire; the third a chalcedony; the fourth an emerald;

You have been built up upon the foundation laid by the Apostles and Prophets, Christ Jesus himself being 'the corner- stone.'