“to the church of God that is in Corinth, to those who are sanctified in Christ Jesus, and called to be saints, with all those in every place who call on the name of our Lord Jesus Christ, their Lord and ours.”
1 Corinthians 1.2
The greetings of Paul’s letters often reflected subjects and themes he would deal with in the body. First Corinthians appeals to a uniform practice in all the churches.
What does it mean to have one Lord?