'Forty Years' in the Bible

For the blessing of the Lord your God has been on you in all the work of your hands: he has knowledge of your wanderings through this great waste: these forty years the Lord your God has been with you, and you have been short of nothing.

And keep in mind the way by which the Lord your God has taken you through the waste land these forty years, so that he might make low your pride and put you to the test, to see what was in your heart and if you would keep his orders or not.

Through all these forty years your clothing did not get old or your feet become tired.

For forty years I have been your guide through the waste land: your clothing has not become old on your backs, or your shoes on your feet.