Luke
Acts 21:10BSB·traditional attribution

After we had been there several days, a prophet named Agabus came down from Judea.

John Calvin Reformed @genevareformer

10. A certain prophet. Though Luke doth not plainly express the same, yet do I conjecture that this Agabus was the same of whom mention is made in the eleventh chapter, (Acts 11:28) who foretold that there should be famine under the reign of Claudius Caesar.

Matthew Henry Presbyterian @wholebiblehenry

We have here Paul and his company arrived at length at Caesarea, where he designed to make some stay, it being the place where the gospel was first preached to the Gentiles, and the Holy Ghost fell upon them, Act 10:1, Act 10:44. Now here we are told, I. Who it was that entertained Paul and his company at Caesarea.

Commenting on Acts 21:8-14

John Gill Reformed Baptist @doctorgill

And as we tarried there many days,.... How many days is not said, it could not be very many, if the apostle got to Jerusalem by Pentecost, as he desired, Act 20:6 there came down from Judea a certain prophet named Agabus; of whom mention is made in Act 11:28 who is there said to come from Jerusalem, to Antioch, and here from Judea to...