For John had said unto Herod, It is not lawful for thee to have thy brother’s wife - Noble fidelity! It was not lawful because Herod’s wife and Herodias’ husband were both living; and further, because the parties were within the forbidden degrees of consanguinity (see Lev 20:21); Herodias being the daughter of Aristobulus, the brother of both Herod and Philip [Josephus, Antiquities, 18.5, 4].