'Forty' in the Bible

And Cainan lived after he had begotten Mahalaleel eight hundred and forty years, and begot sons and daughters.

For in yet seven days I will cause it to rain on the earth forty days and forty nights; and every living being which I have made will I destroy from the ground.

And the pour of rain was on the earth forty days and forty nights.

And the flood was forty days on the earth. And the waters increased, and bore up the ark; and it was lifted up above the earth.

And it came to pass at the end of forty days that Noah opened the window of the ark which he had made.

And he continued yet to speak with him, and said, Perhaps there may be forty found there. And he said, I will not do it for the forty's sake.

And Isaac was forty years old when he took Rebecca as wife, the daughter of Bethuel the Syrian of Padan-Aram, the sister of Laban the Syrian.

And Esau was forty years old, when he took as wives Judith the daughter of Beeri the Hittite, and Basmath the daughter of Elon the Hittite.

thirty milch camels with their colts; forty kine, and ten bulls; twenty she-asses, and ten young asses.

And forty days were fulfilled for him; for so are fulfilled the days of those who are embalmed. And the Egyptians mourned for him seventy days.