Numbers 14:33-34

And your children will be like shepherds, wandering in the wilderness for forty years. In this way, they will pay for your faithlessness, until the last of you lies dead in the wilderness. “‘Because your men explored the land for forty days, you must wander in the wilderness for forty years—a year for each day, suffering the consequences of your sins. Then you will discover what it is like to have me for an enemy.’