This was the same Benaiah who was one of the elite men of the Thirty and in command of the Thirty. His son Ammizabad was responsible for his division.

And Ismaiah the Gibeonite, a strong one among the thirty, and over the thirty; and Jeremiah and Jahaziel and and Johanan and Josabad the Gederathite,

This is the list of David’s mighty men: Jashobeam, the son of a Hachmonite, the chief of the thirty [heroes]. He lifted up his spear against three hundred whom he killed at one time.

Then the Spirit came upon Amasai, leader of the Thirty, and he said, "David, we belong to you; we're with you, son of Jesse! Peace, peace to you, and peace to the one who helps you! For your deliverer is your God."

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.

As for Abshai the brother of Joab, he was chief of the thirty, and he swung his spear against three hundred and killed them; and he had a name as well as the thirty.

Now the Levites were numbered from the age of thirty years and upward: and their number, man by man, was thirty and eight thousand.

Of Naphtali one thousand captains, and with them with shield and spear thirty-seven thousand.

of the sons of Gershom, Joel the chief, and his brothers one hundred thirty;

Shiza the Reubenite's son Adina, a leader of the descendants of Reuben, along with thirty others with him,

And the sons of Bela: Ezbon and Uzzi, and Uzziel, and Jerimoth, and Iri; five; heads of the house of their fathers, mighty, strong ones; and they being enrolled twenty and two thousand and thirty and four.

Now three of the thirty captains went down to the rock to David, into the cave of Adullam; and the host of the Philistines encamped in the valley of Rephaim.

These six were born unto him in Hebron; and there he reigned seven years and six months: and in Jerusalem he reigned thirty and three years.

And with them, by their generations, according to the house of their fathers, were bands of soldiers for war, six and thirty thousand men: for they had many wives and sons.

So they hired thirty and two thousand chariots, and the king of Maachah and his people; who came and encamped before Medeba. And the children of Ammon gathered themselves together from their cities, and came to battle.

And the time that he reigned over Israel was forty years; seven years reigned he in Hebron, and thirty and three years reigned he in Jerusalem.