2 “At that time Herod the tetrarch heard of the fame of Jesus.” For Herod the king, this man's father, he that slew the children, was dead.
But not without a purpose does the evangelist signify the time, but to make you observe also the haughtiness of the tyrant, and his thoughtlessness, in that not at the beginning did he inform himself about Christ, but after a very long time. For such are they that are in places of power, and are encompassed with much pomp, they learn these things late, because they do not make much account of them.
But mark thou, I pray you, how great a thing virtue is, that he was afraid of him even when dead, and out of his fear he speaks wisely even concerning a resurrection.
“For he said,” it is mentioned, “unto his servants, This is John, whom I slew, he is risen from the dead, and therefore the mighty powers do work in him.” Do you see the intensity of his fear? For neither then did he dare to publish it abroad, but he still speaks but to his own servants.
But yet even this opinion savored of the soldier, and was absurd. For many besides had risen from the dead, and no one had wrought anything of the kind. And his words seem to me to be the language both of vanity, and of fear. For such is the nature of unreasonable souls, they admit often a mixture of opposite passions.
But Luke affirms that the multitudes said, “This is Elias, or Jeremias, or one of the old prophets,” but he, as uttering forsooth something wiser than the rest, made this assertion.
But it is probable that before this, in answer to them that said He was John (for many had said this too), he had denied it, and said, “I slew him,” priding himself and glorying in it. For this both Mark and Luke report that he said, “John I beheaded.” But when the rumor prevailed, then he too says the same as the people.
Then the evangelist relates to us also the history. And what might his reason be for not introducing it as a subject by itself? Because all their labor entirely was to tell what related to Christ, and they made themselves no secondary work besides this, except it were again to contribute to the same end. Therefore neither now would they have mentioned the history were it not on Christ's account, and because Herod said, “John is risen again.”
But Mark says, that Herod exceedingly honored the man, and this, when reproved. So great a thing is virtue.
Then his narrative proceeds thus: “For Herod had laid hold on John, and bound him, and put him in prison, for Herodias' sake, his brother Philip's wife. For John said unto him, It is not lawful for you to have her. And when he would have put him to death, he feared the people, because they counted him as a prophet.”
And wherefore does he not address his discourse at all to her, but to the man? Because it depended more on him.
But see how inoffensive he makes his accusation, as relating a history rather than bringing a charge.
Source: Homilies on the Gospel of St. Matthew (New Advent)