'Second in command' in the Bible

They included Joel the leader, Shapham the second in command, Janai, and Shaphat in Bashan.

Ezer was the leader, Obadiah the second in command, Eliab the third,

Asaph was the leader and Zechariah second in command, followed by Jeiel, Shemiramoth, Jehiel, Mattithiah, Eliab, Benaiah, Obed-Edom, and Jeiel. They were to play stringed instruments; Asaph was to sound the cymbals;