And Ishbosheth Saul's son was forty years old when he began to reign over Israel - and reigned two years. But the house of Judah only followed David.

David was thirty years old when he began to reign, and he reigned forty years.

And at forty years' end Absalom said unto the king, "Let me go, I pray thee, to Hebron; and pay my vow which I have vowed unto the LORD.