'Thirty' in the Bible

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, after the house of their fathers, were bands of soldiers for war, six and thirty thousand men: for they had many wives and sons.

And the sons of Bela; Ezbon, and Uzzi, and Uzziel, and Jerimoth, and Iri, five; heads of the house of their fathers, mighty men of valour; and were reckoned by their genealogies 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.

Behold, he was honourable among the thirty, but attained not to the first three: and David set him over his guard.

Adina the son of Shiza the Reubenite, a captain of the Reubenites, and thirty with him,

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

And of Naphtali a thousand captains, and with them with shield and spear thirty and seven thousand.

Of the sons of Gershom; Joel the chief, and his brethren an hundred and thirty:

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

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

This is that Benaiah, who was mighty among the thirty, and above the thirty: and in his course was Ammizabad his son.

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.