The Church as the Body of Christ — 1 Corinthians 12

1Cor 12:12-27: "for just as the body is one and has many members... so it is with Christ." By one Spirit all are baptized into one body, and the diversity of gifts serves the common good.

Augustine — City of God, and John Calvin — Institutes of the Christian Religion. Catholic Church — Catechism of the Catholic Church.

The Spirit who distributes gifts here is the same Spirit of John 15:26 and Pentecost in Acts 2:17. The one baptism into one body connects to Rom 6:3 and Eph 4:4-6.