Jamieson, Fausset and Brown on Acts 24:24-25

24-25. Felix ... with his wife Drusilla ... a Jewess--This beautiful but infamous woman was the third daughter of Herod Agrippa I, who was eaten of worms (see on Ac 12:1), and a sister of Agrippa II, before whom Paul pleaded, Ac 26:1, &c. She was "given in marriage to Azizus, king of the Emesenes, who had consented to be circumcised for the sake of the alliance. But this marriage was soon dissolved, after this manner: When Festus was procurator of Judea, he saw her, and being captivated with her beauty, persuaded her to desert her husband, transgress the laws of her country, and marry himself" [Josephus, Antiquities, 20.7.1,2]. Such was this "wife" of Felix.

he sent for Paul and heard him concerning the faith in Christ--Perceiving from what he had heard on the trial that the new sect which was creating such a stir was represented by its own advocates as but a particular development of the Jewish faith, he probably wished to gratify the curiosity of his Jewish wife, as well as his own, by a more particular account of it from this distinguished champion. And no doubt Paul would so far humor this desire as to present to them the great leading features of the Gospel. But from Ac 24:25 it is evident that his discourse took an entirely practical turn, suited to the life which his two auditors were notoriously leading.