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

[168] So Johanan, and the rulers that were with him, not being able to persuade Gedaliah, went away. But after the interval of thirty days was over, Ishmael came again to Gedaliah, to the city Mispah, and ten men with him; and when he had feasted Ishmael, and those that were with him, in a splendid manner at his table, and had given them presents, he became disordered in drink, while he endeavored to be very merry with them; and when Ishmael saw him in that case, and that he was drowned in his cups to the degree of insensibility, and fallen asleep, he rose up on a sudden, with his ten friends, and slew Gedaliah, and those that were with him at the feast; and when he had slain them, he went out by night, and slew all the Jews that were in the city, and those soldiers also which were left therein by the Babylonians. But the next day fourscore men came out of the country with presents to Gedaliah, none of them knowing what had befallen him; when Ishmael saw them, he invited them in to Gedaliah, and when they were come in, he shut up the court, and slew them, and cast their dead bodies down into a certain deep pit, that they might not be seen; but of these fourscore men Ishmael spared those that entreated him not to kill them, till they had delivered up to him what riches they had concealed in the fields, consisting of their furniture, and garments, and corn: but he took captive the people that were in Mispah, with their wives and children; among whom were the daughters of king Zedekiah, whom Nebuzaradan, the general of the army of Babylon, had left with Gedaliah. And when he had done this, he came to the king of the Ammonites.