'Forty Years' in the Bible

And the land had rest forty years. And Othniel the son of Kenaz died.

So let all thine enemies perish, O LORD, but let those who love him be as the sun when he goes forth in his might. And the land had rest forty years.

So Midian was subdued before the sons of Israel, and they lifted up their heads no more. And the land had rest forty years in the days of Gideon.

And the sons of Israel again did that which was evil in the sight of LORD, and LORD delivered them into the hand of the Philistines forty years.