The Apostle Paul
Galatians 2:17BSB·traditional attribution

But if, while we seek to be justified in Christ, we ourselves are found to be sinners, does that make Christ a minister of sin? Certainly not!

John Calvin Reformed @genevareformer

17. If, while we seek to be justified. He now returns to the Galatians. We must take care not to connect this verse with the preceding one, as if it were a part of the speech addressed to Peter: for what had Peter to do with this argument? It certainly has very little, if anything, to do with the speech; but let every one form his own opinion.

Matthew Henry Presbyterian @wholebiblehenry

I. From the account which Paul gives of what passed between him and the other apostles at Jerusalem, the Galatians might easily discern both the falseness of what his enemies had insinuated against him and their own folly and weakness in departing from that gospel which he had preached to them.

Commenting on Galatians 2:11-21

John Gill Reformed Baptist @doctorgill

But if while we seek to be justified by Christ,.... As they did, and not only sought for, but obtained what they sought for, because they sought for it at the hands of Christ, and not as it were by works, but by faith, even a justifying righteousness in him.