'Forty Years' in the Bible

And your sons shall be fed in the desert forty years, and bear your fornications till your carcasses be finished in the desert

According to the number of days which ye searched out the land, forty days, a day a year, a day for a year, shall ye your iniquities; forty years, and ye knew my withdrawal.

And the anger of Jehovah will kindle against Israel, and he will cause them to wander in the desert forty years, till the finishing of all the generation having done evil in the eyes of Jehovah.