Apostle Peter is a living pillar of stone in the House of God

 Apostle Saint Peter

It is not Apostle Peter is the rock that the Christian Church used to build but our Lord Jesus Christ. Now, what kind of stone is Apostle Peter inside the Temple of God in spirit?

1 Peter 2:4 To whom coming, as unto a living stone, disallowed indeed of men, but chosen of God, and precious, 2:5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.

Apostle Peter was classified as living stone that was built up in a spiritual hose.

Apostle Peter is a pillar of the Temple of God in Spirit

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

They are called foundations of the Christian Church (read Ephesians 2:20)