'Thirty' in the Bible

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

And Samuel took Saul and his servant, and brought them into the parlour, and made them sit in the chiefest place among them that were bidden, which were about thirty persons.

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

Saul was [thirty] years old when he began to reign; he ruled over Israel for [forty] years.

And the Philistines gathered themselves 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 pitched in Michmash, eastward from Bethaven.