Jeremiah 38:6-9

ISV^{(i) 6} So they threw Jeremiah into a cistern that belonged to the king’s son Malchijah and was located in the courtyard of the guard. When they let Jeremiah down with ropes, because there was no water in the cistern—only mud—Jeremiah sank into the mud.
⁷ Jeremiah Rescued from the CisternEbed-melech the Ethiopian, a eunuch in the king’s house, heard that Jeremiah had been put in the cistern. The king was sitting in the Benjamin Gate, ⁸ so Ebed-melech went out of the palace and spoke to the king: ⁹ “Your majesty, these men have acted wickedly in all they have done to the prophet Jeremiah by throwing him into the cistern. He will die where he is because of the famine since there is no more bread in the city.”