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

[488] But the storm of the whole family was removed to Alexander, and all of it rested upon his head. There were three eunuchs who were in the highest esteem with the king, as was plain by the offices they were in about him; for one of them was appointed to be his butler, another of them got his supper ready for him, and the third put him into bed, and lay down by him. Now Alexander had prevailed with these men, by large gifts, to let him use them after an obscene manner; which, when it was told to the king, they were tortured, and found guilty, and presently confessed the criminal conversation he had with them. They also discovered the promises by which they were induced so to do, and how they were deluded by Alexander, who had told them that they ought not to fix their hopes upon Herod, an old man, and one so shameless as to color his hair, unless they thought that would make him young again; but that they ought to fix their attention to him who was to be his successor in the kingdom, whether he would or not; and who in no long time would avenge himself on his enemies, and make his friends happy and blessed, and themselves in the first place; that the men of power did already pay respects to Alexander privately, and that the captains of the soldiery, and the officers, did secretly come to him.