Jeremiah 41:3
Ishmael also killed all the Jews who were with him, [namely], with Gedaliah, at Mizpah, and the Chaldeans who were found there, the men of war.
2 Kings 25:25
But it came to pass in the seventh month, that Ishmael the son of Nethaniah, the son of Elishama, of the royal seed, came, and ten men with him, and smote Gedaliah, so that he died, and the Jews and the Chaldeans who were with him
Ecclesiastes 9:18
Wisdom is better than weapons of war, but one sinner destroys much good.
Jeremiah 41:11-12
But when Johanan the son of Kareah, and all the captains of the forces who were with him, heard of all the evil that Ishmael the son of Nethaniah had done,