And the days that David reigned over Israel [were] forty years,.... So says Eupolemus , an Heathen writer, which are thus reckoned:seven years reigned he in Hebron; the six months over are omitted, 2Sa 5:5; this part of his reign was over Judah only:and thirty three years reigned he in Jerusalem; over the twelve tribes, in all forty, which round number is only given; though in fact he reigned six months more.
Apud Euseb. Praepar. Evangel. l. 9. c.