'Forty Years' in the Bible

For the Israelites walked forty years in the wilderness, until all the nation, that is, the men of war who came out of Egypt, died because they did not listen to the voice of the Lord; to them the Lord had sworn [an oath] that He would not let them see the land which He had promised to their fathers to give us, a land [of abundance] flowing with milk and honey.

I was forty years old when Moses the servant of the Lord sent me from Kadesh-barnea to scout the land [of Canaan], and I brought a report back to him as it was in my heart.

When they cried out to the Lord [for help], He put darkness between you and the Egyptians, and brought the sea upon them and covered them; and your own eyes saw what I did in Egypt. And you lived in the wilderness a long time (forty years).