'Thirty' in the Bible

And the king commandeth Ebed-Melech the Cushite, saying, 'Take with thee from this thirty men, and thou hast brought up Jeremiah the prophet from the pit, before he dieth.'

in the eighteenth year of Nebuchadrezzar -- from Jerusalem, souls, eight hundred thirty and two;

And it cometh to pass, in the thirty and seventh year of the removal of Jehoiachin king of Judah, in the twelfth month, in the twenty and fifth of the month, hath Evil-Merodach king of Babylon lifted up, in the year of his reign, the head of Jehoiachin king of Judah, and bringeth him out from the house of restraint,