'Forty Years' in the Bible

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

So let all your enemies perish, O LORD: but let them that love him be as the sun when it goes forth in its might. And the land had rest forty years.

Thus was Midian subdued before the children of Israel, so that they lifted up their heads no more. And the country was in quietness forty years in the days of Gideon.

And the children of Israel did evil again in the sight of the LORD; and the LORD delivered them into the hand of the Philistines forty years.