The Apostle Paul
Galatians 1:4ESV·traditional attribution

who gave himself for our sins to deliver us from the present evil age, according to the will of our God and Father,

John Calvin Reformed @genevareformer

4. Who gave himself for our sins. He begins with commending the grace of Christ, in order to recall and fix on Him the attention of the Galatians; for, if they had justly appreciated this benefit of redemption, they would never have fallen into opposite views of religion.

Matthew Henry Presbyterian @wholebiblehenry

In these verses we have the preface or introduction to the epistle, where observe, I. The person or persons from whom this epistle is sent - from Paul an apostle, etc., and all the brethren that were with him. 1. The epistle is sent from Paul; he only was the penman of it.

Commenting on Galatians 1:1-5

Albert Barnes Presbyterian @notesbybarnes

Verse 4. Who gave himself for our sins. The reason why Paul so soon introduces this important doctrine, and makes it here so prominent, probably is, that this was the cardinal doctrine of the Christian religion, the great truth which was ever to be kept before the mind, and because this truth had been in fact lost sight of by them.