'Forty Years' in the Bible

For Yahweh your God has blessed you in all the work of your hand; he has known your walking through this great wilderness: these forty years Yahweh your God has been with you; you have lacked nothing.

You shall remember all the way which Yahweh your God has led you these forty years in the wilderness, that he might humble you, to prove you, to know what was in your heart, whether you would keep his commandments, or not.

Your clothing didn't grow old on you, neither did your foot swell, these forty years.

I have led you forty years in the wilderness: your clothes have not grown old on you, and your shoes have not grown old on your feet.