Jeremiah 38:6

Then took they Jeremiah and cast him into the dungeon, a pit formerly used as a cistern, of Malchiah, the son of Hammelech, that was in the court of the prison; and they let down Jeremiah with cords, there being no direct way of access to the bottom of the pit. And in the dungeon there was no water, but mire, the mud and settlings that remained after the water had been drawn out; so Jeremiah sunk in the mire. The act shows the hatred of the princes. They did not have Jeremiah executed with the sword, as they might have done; but they deliberately chose this method of letting the prophet die under the most distressing circumstances, while they, at the same time, could quiet the voice of their conscience by declaring that they had not shed Jeremiah's blood.