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

[254] To these accusations Herod gave credit, and enjoyed hereby, in his miserable case, some sort of consolation, in excuse of his rashness, as fiattering himself with finding things in so bad a condition; but as for the poisonous potion, which he labored to find, he could find none. As for Alexander, he was very desirous to aggravate the vast misfortunes he was under, so he pretended not to deny the accusations, but punished the rashness of his father with a greater crime of his own; and perhaps he was willing to make his father ashamed of his easy belief of such calumnies: he aimed especially, if he could gain belief to his story, to plague him and his whole kingdom; for he wrote four letters, and sent them to him, that he did not need to torture any more persons, for he had plotted against him; and that he had for his partners Pheroras and the most faithful of his friends; and that Salome came in to him by night, and that she lay with him whether he would or not; and that all men were come to be of one mind, to make away with him as soon as they could, and so get clear of the continual fear they were in from him. Among these were accused Ptolemy and Sapinnius, who were the most faithful friends to the king. And what more can be said, but that those who before were the most intimate friends, were become wild beasts to one another, as if a certain madness had fallen upon them, while there was no room for defense or refutation, in order to the discovery of the truth, but all were at random doomed to destruction; so that some lamented those that were in prison, some those that were put to death, and others lamented that they were in expectation of the same miseries; and a melancholy solitude rendered the kingdom deformed, and quite the reverse to that happy state it was formerly in. Herod's own life also was entirely disturbed; and because he could trust nobody, he was sorely punished by the expectation of further misery; for he often fancied in his imagination that his son had fallen upon him, or stood by him with a sword in his hand; and thus was his mind night and day intent upon this thing, and revolved it over and over, no otherwise than if he were under a distraction. And this was the sad condition Herod was now in.