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

[637] And now it was that, at the king's command, Nicolaus, when he had premised a great deal about the craftiness of Antipater, and had prevented the effects of their commiseration to him, afterwards brought in a bitter and large accusation against him, ascribing all the wickedness that had been in the kingdom to him, and especially the murder of his brethren; and demonstrated that they had perished by the calumnies he had raised against them. He also said that he had laid designs against them that were still alive, as if they were laying plots for the succession; and (said he) how can it be supposed that he who prepared poison for his father should abstain from mischief as to his brethren? He then proceeded to convict him of the attempt to poison Herod, and gave an account in order of the several discoveries that had been made; and had great indignation as to the affair of Pheroras, because Antipater had been for making him murder his brother, and had corrupted those that were dearest to the king, and filled the whole palace with wickedness; and when he had insisted on many other accusations, and the proofs for them, he left off.