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

[143] But these were not satisfied with the bonds into which they had put the men forementioned; nor did they think it safe for them to keep them thus in custody long, since they were men very powerful, and had numerous families of their own that were able to avenge them. Nay, they thought the very people would perhaps be so moved at these unjust proceedings, as to rise in a body against them; it was therefore resolved to have them slain accordingly, they sent one John, who was the most bloody-minded of them all, to do that execution: this man was also called "the son of Dorcas," ¹ in the language of our country. Ten more men went along with him into the prison, with their swords drawn, and so they cut the throats of those that were in custody there. The grand lying pretence these men made for so flagrant an enormity was this, that these men had had conferences with the Romans for a surrender of Jerusalem to them; and so they said they had slain only such as were traitors to their common liberty. Upon the whole, they grew the more insolent upon this bold prank of theirs, as though they had been the benefactors and saviors of the city.