'Forty Years' in the Bible

For the sons of Israel walked forty years in the wilderness, until all the nation, that is, the men of war who came out of Egypt, perished because they did not listen to the voice of the Lord, to whom the Lord had sworn that He would not let them see the land which the Lord had sworn to their fathers to give us, a land flowing with milk and honey.

I was forty years old when Moses the servant of the Lord sent me from Kadesh-barnea to spy out the land, and I brought word back to him as it was in my heart.