But Herod the tetrarch, when he was reproved by him for Herodias, his brother’s wife, and for all the evils which Herod had done;

“And as in the Gospel according to St. John it is related of Christ that He spoke many other things, so also in this place we must understand Luke to say the same of John the Baptist, since certain things are announced by John too great to be entrusted to writing. But we marvel at John, because among them that are born of women there was not a greater than he, for by his good deeds he had been exalted to so high a fame for virtue, that by many he was supposed to be Christ. But what is much more marvellous he feared not Herod, nor dreaded death, as it follows, But Herod the tetrarch being reproved by him.”

“See in St. Mark vi. 17. The wife of his brother (Philip.) The Greek adds the name, and he is also named in St. Mark; but he is a different person from the tetrarch, mentioned in chap. iii. ver. 1. (Bible de Vence) — It was not at this time that John [the Baptist] was cast into prison; but, as St. John [the evangelist] relates, after our Saviour had begun to work miracles, and after his baptism. St. Luke anticipates this event, in order to describe more strongly the malice of Herod; who, whilst he saw multitudes flocking to hear the words of John, his own soldiers believing, and all the people receiving baptism, still could despise the Baptist, could imprison him, and put him to death. (Ven. Bede)”

“But Herod, &c.--See on Mar 6:14, &c. (Also see on Mat 3:12.) and for all the evils which Herod had done--important fact here only mentioned, showing how thoroughgoing was the fidelity of the Baptist to his royal hearer, and how strong must have been the workings of conscience in that slave of passion when, notwithstanding such plainness, he "did many things and heard John gladly" (Mar 6:20, Mar 6:26).”