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

[164] In the mean time, the Jews were so distressed by the fights they had been in, as the war advanced higher and higher, and creeping up to the holy house itself, that they, as it were, cut off those limbs of their body which were infected, in order to prevent the distemper's spreading further; for they set the north-west cloister, which was joined to the tower of Antonia, on fire, and after that brake off about twenty cubits of that cloister, and thereby made a beginning in burning the sanctuary; two days after which, or on the twenty-fourth day of the forenamed month, [Panemus or Tamuz,] the Romans set fire to the cloister that joined to the other, when the fire went fifteen cubits farther. The Jews, in like manner, cut off its roof; nor did they entirely leave off what they were about till the tower of Antonia was parted from the temple, even when it was in their power to have stopped the fire; nay, they lay still while the temple was first set on fire, and deemed this spreading of the fire to be for their own advantage. However, the armies were still fighting one against another about the temple, and the war was managed by continual sallies of particular parties against one another.