'Forty' 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.

When I had gone up into the mountain to be given the stones on which was recorded the agreement which the Lord made with you, I was on the mountain for forty days and forty nights without taking food or drinking water.

Then at the end of forty days and forty nights the Lord gave me those stones, the stones of the agreement.

And I went down on my face before the Lord, as at the first, for forty days and forty nights, without taking food or drinking water, because of all your sin, in doing evil in the eyes of the Lord and moving him to wrath.

So I went down on my face in prayer before the Lord for forty days and forty nights as I did at first; because the Lord had said that he would put an end to you.

And I was in the mountain, as at the first time, for forty days and forty nights; and again the ears of the Lord were open to my prayer, and he did not send destruction on you.

He may be given forty blows, not more; for if more are given, your brother may be shamed before you.

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.