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

[100] These were the accusations which Herod laid with great vehemency against his sons before Caesar. Now the young men, both while he was speaking, and chiefly at his concluding, wept, and were in confusion. Now as to themselves, they knew in their own conscience they were innocent; but because they were accused by their father, they were sensible, as the truth was, that it was hard for them to make their apology, since though they were at liberty to speak their minds freely as the occasion required, and might with force and earnestness refute the accusation, yet was it not now decent so to do. There was therefore a difficulty how they should be able to speak; and tears, and at length a deep groan, followed, while they were afraid, that if they said nothing, they should seem to be in this difficulty from a consciousness of guilt, - nor had they any defense ready, by reason of their youth, and the disorder they were under; yet was not Caesar unapprized, when he looked upon them in the confusion they were in, that their delay to make their defense did not arise from any consciousness of great enormities, but from their unskilfulness and modesty. They were also commiserated by those that were there in particular; and they moved their father's affections in earnest till he had much ado to conceal them.