'Thirty' in the Bible

And the Philistines fought, and Israel was routed, and they fled every man to his tent; and there was a very great slaughter, and there fell of Israel thirty thousand footmen.

And Samuel took Saul and his servant, and brought them into the chamber, and gave them a place at the head of them that were invited; and they were about thirty persons.

And he numbered them in Bezek, and the children of Israel were three hundred thousand, and the men of Judah thirty thousand.

And the Philistines were assembled together to fight with Israel, thirty thousand chariots, and six thousand horsemen, and people as the sand which is on the sea-shore in multitude; and they came up, and encamped in Michmash, eastward from Beth-Aven.