Length of reign forty years
the Holy Bible

--1 Kings--

And the days that David reigned over Israel [were] forty years: seven years reigned he in Hebron, and thirty and three years reigned he in Jerusalem. (2:11)

--1 Chronicles--

And the time that he reigned over Israel [was] forty years; seven years reigned he in Hebron, and thirty and three [years] reigned he in Jerusalem. (29:27)

And he died in a good old age, full of days, riches, and honour: and Solomon his son reigned in his stead. (29:28)

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