The Apostle Paul
Ephesians 2:20ESV·traditional attribution

built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone,

John Calvin Reformed @genevareformer

20. And are built. The third comparison illustrates the manner in which the Ephesians, and all other Christians are admitted to the honor of being fellow-citizens with the saints and of the household of God. They are built on the foundation, — they are founded on the doctrine, of the apostles and prophets. We are thus enabled to distinguish between a true and a false church.

Matthew Henry Presbyterian @wholebiblehenry

We have now come to the last part of the chapter, which contains an account of the great and mighty privileges that converted Jews and Gentiles both receive from Christ. The apostle here shows that those who were in a state of enmity are reconciled. Between the Jews and the Gentiles there had been a great enmity; so there is between God and every unregenerate man.

Commenting on Ephesians 2:14-22

John Gill Reformed Baptist @doctorgill

And are built upon the foundation of the apostles and prophets,.... The prophets of the Old Testament, and the apostles of the New, who agree in laying ministerially the one and only foundation, Jesus Christ; for not the persons of the apostles and prophets, nor their doctrines merely, are here meant; but Christ who is contained in them, and who is the foundation on which...