Paul, called to be an Apostle of Jesus Christ, through the will of God, and Sosthenes our brother, unto the Church of God which is at Corinth, even them that are sanctified in Christ Jesus, called to be Saints, with all that call upon the name of our Lord Jesus Christ in every place, their Lord and ours: Grace unto you and peace from God our Father and the Lord Jesus Christ.
Source: Homilies on First Corinthians (New Advent)