JER 38:6

6 Then took they Yirmeyah, and cast him into the bor [(pit, dungeon, cistern)] of Malkiyah Ben Hammelech, that was in the Khatzer [(courtyard)] of the Guard; and they lowered Yirmeyah with ropes. And in the bor [(pit)] there was no mayim, but mud; so Yirmeyah sank in the mud.