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

[21] And now there were three treacherous factions in the city, the one parted from the other. Eleazar and his party, that kept the sacred first-fruits, came against John in their cups. Those that were with John plundered the populace, and went out with zeal against Simon. This Simon had his supply of provisions from the city, in opposition to the seditious. When, therefore, John was assaulted on both sides, he made his men turn about, throwing his darts upon those citizens that came up against him, from the cloisters he had in his possession, while he opposed those that attacked him from the temple by his engines of war. And if at any time he was freed from those that were above him, which happened frequently, from their being drunk and tired, he sallied out with a great number upon Simon and his party; and this he did always in such parts of the city as he could come at, till he set on fire those houses that were full of corn, and of all other provisions. ¹ The same thing was done by Simon, when, upon the other's retreat, he attacked the city also; as if they had, on purpose, done it to serve the Romans, by destroying what the city had laid up against the siege, and by thus cutting off the nerves of their own power. Accordingly, it so came to pass, that all the places that were about the temple were burnt down, and were become an intermediate desert space, ready for fighting on both sides of it; and that almost all that corn was burnt, which would have been sufficient for a siege of many years. So they were taken by the means of the famine, which it was impossible they should have been, unless they had thus prepared the way for it by this procedure.