2 Samuel 5:4-5 NIV

4 David was thirty years old1 when he became king, and he reigned2 forty3 years.

References for 2 Samuel 5:4

5 In Hebron he reigned over Judah seven years and six months,4 and in Jerusalem he reigned over all Israel and Judah thirty-three years.

References for 2 Samuel 5:5