'Thirty' in the Bible

This is the list of David’s warriors:Jashobeam son of Hachmoni was chief of the Thirty; he wielded his spear against 300 and killed them at one time.

He was the most honored of the Thirty, but he did not become one of the Three. David put him in charge of his bodyguard.

Ishmaiah the Gibeonite, a warrior among the Thirty and a leader over the Thirty;Jeremiah, Jahaziel, Johanan, Jozabad the Gederathite;

Then the Spirit took control of Amasai, chief of the Thirty, and he said:We are yours, David,we are with you, son of Jesse!Peace, peace to you,and peace to him who helps you,for your God helps you.So David received them and made them leaders of his troops.

This Benaiah was a mighty man among the Thirty and over the Thirty, and his son Ammizabad was in charge of his division.