Luke
Acts 18:25BSB·traditional attribution

He had been instructed in the way of the Lord and was fervent in spirit. He spoke and taught accurately about Jesus, though he knew only the baptism of John.

John Calvin Reformed @genevareformer

25. He was instructed. That which Luke addeth shortly after seemeth not to agree with this commendation, to wit, that he knew only the baptism of John. But this latter member is added by way of correction. Nevertheless, these two agree very well together; that he understood the doctrine of the gospel, because he both knew that the Redeemer was given to the world, and...

Matthew Henry Presbyterian @wholebiblehenry

The sacred history leaves Paul upon his travels, and goes here to meet Apollos at Ephesus, and to give us some account of him, which was necessary to our understanding some passages in Paul's epistles. I. Here is an account of his character, when he came to Ephesus. 1.

Commenting on Acts 18:24-28

John Gill Reformed Baptist @doctorgill

And when he was disposed to pass into Achaia, &c. The chief city of which was Corinth, and whither Apollos went, as appears from Act 19:1. What disposed him to go thither, after he had received a greater degree of light and knowledge, was no doubt that he might communicate it, to the good of others, to which he was moved by the Holy Ghost...