David [was] thirty years old when he began reign,.... Over Judah, which was the age of his antitype Christ, when he entered upon his public ministry, Luke 3:23;
[and] he reigned forty years; and six months, as appears by 2 Samuel 5:5; but the months are not mentioned, only the round number of years given: two reasons the Jews a give for this; the one, that he fled six months from Absalom; the other is, that he was ill in Hebron so long, and therefore are not reckoned.
a Hieron. Trad. Heb. in lib. Reg. fol. 77. I.