'Forty' in the Bible

Then Kenan lived eight hundred and forty years after he became the father of Mahalalel, and he had other sons and daughters.

For after seven more days, I will send rain on the earth forty days and forty nights; and I will blot out from the face of the land every living thing that I have made.”

The rain fell upon the earth for forty days and forty nights.

Then the flood came upon the earth for forty days, and the water increased and lifted up the ark, so that it rose above the earth.

Then it came about at the end of forty days, that Noah opened the window of the ark which he had made;

He spoke to Him yet again and said, “Suppose forty are found there?” And He said, “I will not do it on account of the forty.”

and Isaac was forty years old when he took Rebekah, the daughter of Bethuel the Aramean of Paddan-aram, the sister of Laban the Aramean, to be his wife.

When Esau was forty years old he married Judith the daughter of Beeri the Hittite, and Basemath the daughter of Elon the Hittite;

thirty milking camels and their colts, forty cows and ten bulls, twenty female donkeys and ten male donkeys.

Now forty days were required for it, for such is the period required for embalming. And the Egyptians wept for him seventy days.