Jeremiah 38:6-10

So they took Jeremiah and threw him into the cistern of Malchijah the king’s son, which was in the courtyard of the guardhouse; and they let Jeremiah down with ropes. Now in the cistern there was no water but only mud, and Jeremiah sank into the mud.

But Ebed-melech the Ethiopian, a eunuch, while he was in the king’s palace, heard that they had put Jeremiah in the cistern. Now the king was sitting at the Gate of Benjamin;

and Ebed-melech went out from the king’s palace and spoke to the king, saying,

“My lord the king, these men have acted wickedly in all that they have done to Jeremiah the prophet whom they have thrown into the cistern; and he will die right where he is because of the famine, for there is no more bread in the city.”

Then the king commanded Ebed-melech the Ethiopian, saying, “Take thirty men from here under your authority and bring Jeremiah the prophet up from the cistern before he dies.”