Now the pit wherein Ishmael had cast all the dead bodies of the men, whom he had slain because of Gedaliah, was it which Asa the king had made for fear of Baasha king of Israel: and Ishmael the son of Nethaniah filled it with them that were slain. Now the pit - was it which Asa the king had made for fear of Baasha - See 1 Kings 15:22. Asa made this cistern as a reservoir for water for the supply of the place; for he built and fortified Mizpah at the time that he was at war with Baasha, king of Israel.
Related Commentaries of Jeremiah 41:9
Jeremiah 41:9
9 Now the pit wherein Ishmael had cast all the dead bodies of the men, whom he had slain becauseb of Gedaliah, was it which Asa the king had made for fear of Baasha king of Israel: and Ishmael the son of Nethaniah filled it with them that were slain.