John Gill Commentary Acts 21:8

"And on the morrow we departed, and came unto Caesarea: and entering into the house of Philip the evangelist, who was one of the seven, we abode with him." — Acts 21:8 (ASV)

And the next day we that were of Paul's company departed ,
&c.] From Ptolemais, as Sopater, Aristarchus, Secundus, Timotheus, Tychicus, Trophimus, and Luke, the writer of this history; see (Acts 20:4)

and came unto Caesarea ;
not Caesarea Philippi, mentioned in (Matthew 16:13) but that Caesarea which was formerly called Strato's tower, and was a very good sea port; see (Acts 8:40) (9:30) (10:1) (18:22) .

and we entered into the house of Philip the evangelist ;
not a writer of a Gospel, but a preacher of the Gospel, and perhaps not an ordinary one, but was one of those spoken of in (Ephesians 4:11) which was an office inferior to an apostle, and yet above an ordinary pastor and teacher; this man, very likely, was the same that taught in Samaria, and baptized the eunuch, and who after that settled at Caesarea; see (Acts 8:40) .

which was one of the seven ;
of the seven deacons of the church at Jerusalem, (Acts 6:5) and abode with him; so long as they continued at Caesarea.