Jeremiah 41:9
The Message Bible (MSG)
Ishmael's reason for dumping the bodies into a cistern was to cover up the earlier murder of Gedaliah. The cistern had been built by king Asa as a defense against Baasha king of Israel. This was the cistern that Ishmael son of Nethaniah filled with the slaughtered men.— Jeremiah 41:9 (MSG)