'Forty' in the Bible

And Solomon reigned in Jerusalem over all Israel forty years.

So king Rehoboam strengthened himself in Jerusalem, and reigned: for Rehoboam was forty and one years old when he began to reign, and he reigned seventeen years in Jerusalem, the city which Jehovah had chosen out of all the tribes of Israel, to put his name there: and his mother's name was Naamah the Ammonitess.

Forty and two years old was Ahaziah when he began to reign; and he reigned one year in Jerusalem: and his mother's name was Athaliah the daughter of Omri.

Joash was seven years old when he began to reign; and he reigned forty years in Jerusalem: and his mother's name was Zibiah, of Beer-sheba.