http://biblebitbybit.blogspot.com/2016/01/1-corinthians-1-v-2.html
Posted by 1 Corinthians on Sunday, 17 March 2013
1 Corinthians 1:2
Unto the church of God which is at Corinth, to them that are sanctified in Christ Jesus, called to be saints, with all that in every place call upon the name of Jesus Christ our Lord, both theirs and ours:
1:2. The church belongs to God, not man. Had the Corinthians recognized this, their problem of division might not have existed. Those who compose the church have been sanctified, set apart by God as His possession. The burden of Paul’s letter was that the Corinthians’ practice might more nearly approximate their position. Christ Jesus as Lord was to be obeyed. Herein was unity for Christians not only in Corinth but everywhere.
Excerpt from:
Walvoord, J. F., Zuck, R. B., & Dallas Theological Seminary. (1983-c1985).
The Bible knowledge commentary : An Exposition of the Scriptures.
Wheaton, IL: Victor Books.