'Thirty' in the Bible

And the Philistines fight, and Israel is smitten, and they flee each to his tents, and the blow is very great, and there fall of Israel thirty thousand footmen;

And Samuel taketh Saul, and his young man, and bringeth them in to the chamber, and giveth to them a place at the head of those called; and they are about thirty men.

And he inspecteth them in Bezek, and the sons of Israel are three hundred thousand, and the men of Judah thirty thousand.

And the Philistines have been gathered to fight with Israel; thirty thousand chariots, and six thousand horsemen, and a people as the sand which is on the sea-shore for multitude; and they come up and encamp in Michmash, east of Beth-Aven.