Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[206] For Pheroras came to Alexander, the husband of Glaphyra, who was the daughter of Archelaus, as we have already told you, and said that he had heard from Salome that Herod has enamored on Glaphyra, and that his passion for her was incurable. When Alexander heard that, he was all on fire, from his youth and jealousy; and he interpreted the instances of Herod's obliging behavior to her, which were very frequent, for the worse, which came from those suspicions he had on account of that word which fell from Pheroras; nor could he conceal his grief at the thing, but informed him what word: Pheroras had said. Upon which Herod was in a greater disorder than ever; and not bearing such a false calumny, which was to his shame, was much disturbed at it; and often did he lament the wickedness of his domestics, and how good he had been to them, and how ill requitals they had made him. So he sent for Pheroras, and reproached him, and said, "Thou vilest of all men! art thou come to that unmeasurable and extravagant degree of ingratitude, as not only to suppose such things of me, but to speak of them? I now indeed perceive what thy intentions are. It is not thy only aim to reproach me, when thou usest such words to my son, but thereby to persuade him to plot against me, and get me destroyed by poison. And who is there, if he had not a good genius at his elbow, as hath my son, but would not bear such a suspicion of his father, but would revenge himself upon him? Dost thou suppose that thou hast only dropped a word for him to think of, and not rather hast put a sword into his hand to slay his father? And what dost thou mean, when thou really hatest both him and his brother, to pretend kindness to them, only in order to raise a reproach against me, and talk of such things as no one but such an impious wretch as thou art could either devise in their mind, or declare in their words? Begone, thou art such a plague to thy benefactor and thy brother, and may that evil conscience of thine go along with thee; while I still overcome my relations by kindness, and am so far from avenging myself of them, as they deserve, that I bestow greater benefits upon them than they are worthy of."