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

[58] Now there was a sedition of the men that were within the city, who did not agree what was to be done in their present circumstances, while some thought it best to deliver up the city to Pompey; but Aristobulus's party exhorted them to shut the gates, because he was kept in prison. Now these prevented the others, and seized upon the temple, and cut off the bridge which reached from it to the city, and prepared themselves to abide a siege; but the others admitted Pompey's army in, and delivered up both the city and the king's palace to him. So Pompey sent his lieutenant Piso with an army, and placed garrisons both in the city and in the palace, to secure them, and fortified the houses that joined to the temple, and all those which were more distant and without it. And in the first place, he offered terms of accommodation to those within; but when they would not comply with what was desired, he encompassed all the places thereabout with a wall, wherein Hyrcanus did gladly assist him on all occasions; but Pompey pitched his camp within [the wall], on the north part of the temple, where it was most practicable; but even on that side there were great towers, and a ditch had been dug, and a deep valley begirt it round about, for on the parts towards the city were precipices, and the bridge on which Pompey had gotten in was broken down. However, a bank was raised, day by day, with a great deal of labor, while the Romans cut down materials for it from the places round about. And when this bank was sufficiently raised, and the ditch filled up, though but poorly, by reason of its immense depth, he brought his mechanical engines and battering-rams from Tyre, and placing them on the bank, he battered the temple with the stones that were thrown against it. And had it not been our practice, from the days of our forefathers, to rest on the seventh day, this bank could never have been perfected, by reason of the opposition the Jews would have made; for though our law gives us leave then to defend ourselves against those that begin to fight with us and assault us, yet does it not permit us to meddle with our enemies while they do any thing else.