Jeremiah 38:9-10

My lord the king, these men have done evil in all that they have done to Jeremiah the prophet, whom they have cast into the dungeon or cistern pit; and he is liable to die of hunger and is [as good as] dead in the place where he is, for there is no more bread left in the city. Then the king commanded Ebed-melech the Ethiopian, saying, Take from here thirty men with you and raise Jeremiah the prophet out of the dungeon or cistern pit before he dies.