The Bible
Jeremiah 38
The rulers cast Jeremiah into a muddy dungeon—He is freed by Ebed-melech, an Ethiopian, and put in the court of the prison—Jeremiah counsels Zedekiah concerning the war.

8Ebed-melech went forth out of the king’s house, and spake to the king, saying,
21But if thou refuse to go forth, this is the word that the Lord hath shewed me:
24¶ Then said Zedekiah unto Jeremiah, Let no man know of these words, and thou shalt not die.