Jeremiah 38:6-7

So they took me and put me into the muddy cistern of the king’s son Malchiah in the palace courtyard. There was little water in the cistern, only mud. They lowered me down with ropes, and I sank down deep into the mud. Ebed-Melech the Ethiopian, a palace official, heard that I had been put into the cistern. As the king was sitting in the Benjamin Gate