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

[265] But this calamity of the Jews' friends, who fell in this battle, grieved them, as did also this plundering of the money dedicated to God in the temple. Accordingly, that body of them which continued best together, and was the most warlike, encompassed the palace, and threatened to set fire to it, and kill all that were in it. Yet still they commanded them to go out presently, and promised, that if they would do so, they would not hurt them, nor Sabinus neither; at which time the greatest part of the king's troops deserted to them, while Rufus and Gratus, who had three thousand of the most warlike of Herod's army with them, who were men of active bodies, went over to the Romans. There was also a band of horsemen under the command of Ruffis, which itself went over to the Romans also. However, the Jews went on with the siege, and dug mines under the palace walls, and besought those that were gone over to the other side not to be their hinderance, now they had such a proper opportunity for the recovery of their country's ancient liberty; and for Sabinus, truly he was desirous of going away with his soldiers, but was not able to trust himself with the enemy, on account of what mischief he had already done them; and he took this great [pretended] lenity of theirs for an argument why he should not comply with them; and so, because he expected that Varus was coming, he still bore the siege.