'Second in command' in the Bible

And Joel son of Zicri, their chief officer; and Judah son of Hassenuah, second [in command] over the city.

For Mordecai the Jew [was] second-in-command to King Ahasuerus. [He was] great for the Jews and popular with many of his brothers, for he sought good for his people, {interceding for the welfare of all his descendants}.