2 Corinthians 13:13

All the saints salute you.

This included not merely Paul and his companions but included all Christians throughout the world. Although the Corinthians were not personally known by very many Christians throughout the ancient world, nevertheless the community of interest, mutual affection, and highest brotherly respect were properly considered to be the right of every Christian on earth. This word indicated clearly that Paul still considered the church at Corinth as a valid part of the larger body of Christ on earth, and that in spite of the disorders which threatened them. See 2 Corinthians 1:1, and also 1 Corinthians 1:4.