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

[173] But when Johanan and the rulers with him heard of what was done at Mispah by Ishmael, and of the death of Gedaliah, they had indignation at it, and every one of them took his own armed men, and came suddenly to fight with Ishmael, and overtook him at the fountain in Hebron. And when those that were carried away captives by Ishmael saw Johanan and the rulers, they were very glad, and looked upon them as coming to their assistance; so they left him that had carried them captives, and came over to Johanan: then Ishmael, with eight men, fled to the king of the Ammonites; but Johanan took those whom he had rescued out of the hands of Ishmael, and the eunuchs, and their wives and children, and came to a certain place called Mandra, and there they abode that day, for they had determined to remove from thence and go into Egypt, out of fear, lest the Babylonians should slay them, in case they continued in the country, and that out of anger at the slaughter of Gedaliah, who had been by them set over it for governor.