Jeremiah 38:6-7

Then took they Jeremiah, and cast him into the dungeon of Malchijah the king’s son, that was in the court of the guard: and they let down Jeremiah with cords. And in the dungeon there was no water, but mire; and Jeremiah sank in the mire. Now when Ebed-melech the Ethiopian, a eunuch, who was in the king’s house, heard that they had put Jeremiah in the dungeon (the king then sitting in the gate of Benjamin)