According to the Talmud, Gedaliah was killed on the third of the month. Other sources suggest that Gedaliah was killed on the first of the month, but the fast is delayed until after Rosh Hashanah, since fasting is prohibited during a festival.

Who murdered Gedaliah?

Ishmael son of Nethaniah, and the ten men who were with him, murdered Gedaliah, together with most of the Jews who had joined him and many Babylonians whom Nebuchadnezzar had left with Gedaliah (Jeremiah 41:2–3).

What did Gedaliah do in the Bible?

mournfully recalls the assassination of Gedaliah, Jewish governor of Judah and appointee of Nebuchadrezzar, the Babylonian king. Gedaliah, a supporter of Jeremiah, was slain by Ishmael, a member of the former royal family of Judah. When the remaining Jews fled to Egypt, Jewish self-rule was thus effectively ended.