'Forty' in the Bible

For in seven days I am going to cause it to rain on the earth for forty days and forty nights; and I will destroy (blot out, wipe away) every living thing that I have made from the surface of the earth.”

It rained on the earth for forty days and forty nights.

The flood [the great downpour of rain] was forty days and nights on the earth; and the waters increased and lifted up the ark, and it floated [high] above the land.

At the end of [another] forty days Noah opened the window of the ark which he had made;

Abraham spoke to Him yet again and said, “Suppose [only] forty are found there.” And He said, “I will not do it for the sake of the forty [who are righteous].”

Isaac was forty years old when he married Rebekah, the daughter of Bethuel the Aramean (Syrian) of Paddan-aram, the sister of Laban the Aramean.

Now forty days were required for this, for that is the customary number of days [of preparation] required for embalming. And the Egyptians wept and grieved for him [in public mourning as they would for royalty] for seventy days.