JER 41:9

9 Now the cistern wherein Yishmael had cast all the pigrei ha'anashim [(dead bodies of the men)], whom he had slain because of Gedalyahu, was the same cistern which Asa HaMelech had made for defense against Ba'asha Melech Yisroel: and Yishmael ben Netanyah filled it with them that were slain.