John Calvin Reformed @genevareformer

1. Paul, called to be an Apostle In this manner does Paul proceed, in almost all the introductions to his Epistles, with the view of procuring for his doctrine authority and favor. The former he secures to himself from the station that had been assigned to him by God, as being an Apostle of Christ sent by God; the latter by testifying his affection towards those to whom he writes.

Matthew Henry Presbyterian @wholebiblehenry

We have here the apostle's preface to his whole epistle, in which we may take notice, I. Of the inscription, in which, according to the custom of writing letters then, the name of the person by whom it was written and the persons to whom it was written are both inserted. 1.

Commenting on 1 Corinthians 1:1-9

John Gill Reformed Baptist @doctorgill

Paul called to be an apostle of Jesus Christ,.... The author, or rather the writer of the following epistle; for the Holy Ghost was the author and dictator of it, and which was never doubted: he is described by his, name Paul, though his Jewish name was Saul; and very probably he being a Jew by birth, and yet born in a Roman city, might...