Luke
Acts 13:43BSB·traditional attribution

After the synagogue was dismissed, many of the Jews and devout converts to Judaism followed Paul and Barnabas, who spoke to them and urged them to continue in the grace of God.

John Calvin Reformed @genevareformer

43. Who speaking. The sense is doubtful. For it may be referred unto the Jews and proselytes, that they exhorted Paul and Barnabas that they should not faint, but stand stoutly in the grace of God. Neither did they want occasion; for they saw combats prepared for them; and that therefore they had need of invincible constancy to suffer and abide the brunts of the contrary faction.

Matthew Henry Presbyterian @wholebiblehenry

The design of this story being to vindicate the apostles, especially Paul (as he doth himself at large, Rom. 11), from the reflections of the Jews upon him for preaching the gospel to the Gentiles, it is here observed that he proceeded therein with all the caution imaginable, and upon due consideration, of which we have here an instance. I.

Commenting on Acts 13:42-52

John Gill Reformed Baptist @doctorgill

Then Paul and Barnabas waxed bold,.... They were not at all daunted at the opposition they met with, but rather grew more courageous, and used great liberty of speech, and spoke out freely, plainly, and openly: and said, it was necessary that the word of God should first have been spoken to you; as it was by Christ and his apostles, whilst he was on...