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

[467] BUT now the quarrel that was between them still accompanied these brethren when they parted, and the suspicions they had one of the other grew worse. Alexander and Aristobulus were much grieved that the privilege of the first-born was confirmed to Antipater; as was Antipater very angry at his brethren that they were to succeed him. But then this last being of a disposition that was mutable and politic, he knew how to hold his tongue, and used a great deal of cunning, and thereby concealed the hatred he bore to them; while the former, depending on the nobility of their births, had every thing upon their tongues which was in their minds. Many also there were who provoked them further, and many of their [seeming] friends insinuated themselves into their acquaintance, to spy out what they did. Now every thing that was said by Alexander was presently brought to Antipater, and from Antipater it was brought to Herod with additions. Nor could the young man say any thing in the simplicity of his heart, without giving offense, but what he said was still turned to calumny against him. And if he had been at any time a little free in his conversation, great imputations were forged from the smallest occasions. Antipater also was perpetually setting some to provoke him to speak, that the lies he raised of him might seem to have some foundation of truth; and if, among the many stories that were given out, but one of them could be proved true, that was supposed to imply the rest to be true also. And as to Antipater's friends, they were all either naturally so cautious in speaking, or had been so far bribed to conceal their thoughts, that nothing of these grand secrets got abroad by their means. Nor should one be mistaken if he called the life of Antipater a mystery of wickedness; for he either corrupted Alexander's acquaintance with money, or got into their favor by flatteries; by which two means he gained all his designs, and brought them to betray their master, and to steal away, and reveal what he either did or said. Thus did he act a part very cunningly in all points, and wrought himself a passage by his calumnies with the greatest shrewdness; while he put on a face as if he were a kind brother to Alexander and Aristobulus, but suborned other men to inform of what they did to Herod. And when any thing was told against Alexander, he would come in, and pretend [to be of his side], and would begin to contradict what was said; but would afterward contrive matters so privately, that the king should have an indignation at him. His general aim was this, - to lay a plot, and to make it believed that Alexander lay in wait to kill his father; for nothing afforded so great a confirmation to these calumnies as did Antipater's apologies for him.