'Forty Years' in the Bible

And the land will rest forty years: and Othniel, son of Kenaz, will die.

So shall all thine enemies perish, O Jehovah: And those loving him, as the going forth of the sun in his strength. And the land will rest forty years.

And Midian will be subdued before the sons of Israel, and they will not add to lift up their head: and the land will rest forty years in the days of Gideon.

And the sons of Israel will add to do evil in the eyes of Jehovah; and Jehovah will give them into the hand of Philisteim forty years.