Jeremiah 41:4-7

4Now it happened on the second day after the killing of Gedaliah, before anyone knew about it,

5that eighty men came from Shechem, from Shiloh, and from Samaria with their beards shaved off and their clothes torn and their bodies cut, carrying in their hands grain offerings and incense to present at the [site of the] house of the Lord [in Jerusalem].

6Then Ishmael the son of Nethaniah went out from Mizpah to meet them, weeping [false tears] as he went. As he met them, he said to them, “Come to Gedaliah the son of Ahikam!”

7Yet when they came into the city, Ishmael the son of Nethaniah and the men who were with him slaughtered them and threw them into the cistern (underground water reservoir).