Jeremiah 38:6, 10-13

So they took Jeremiah and cast him into the cistern of Malchiah, the king’s son, which was in the court of the guard, letting Jeremiah down by ropes. And there was no water in the cistern, but only mud, and Jeremiah sank in the mud.

Then the king commanded Ebed-melech the Ethiopian, “Take thirty men with you from here, and lift Jeremiah the prophet out of the cistern before he dies.” So Ebed-melech took the men with him and went to the house of the king, to a wardrobe in the storehouse, and took from there old rags and worn-out clothes, which he let down to Jeremiah in the cistern by ropes. Then Ebed-melech the Ethiopian said to Jeremiah, “Put the rags and clothes between your armpits and the ropes.” Jeremiah did so. Then they drew Jeremiah up with ropes and lifted him out of the cistern. And Jeremiah remained in the court of the guard.