2 Samuel 2:11
The length of time that David was king in Hebron over the house of Judah was seven years and six months.
1 Kings 2:11
The length of time David reigned over Israel was 40 years: he reigned seven years in Hebron and 33 years in Jerusalem.
2 Samuel 5:4-5
David was 30 years old when he began his reign;
1 Chronicles 3:4
1 Chronicles 29:27
The length of his reign over Israel was 40 years; he reigned in Hebron for seven years and in Jerusalem for 33.