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.

2 Samuel 5:4-5

David was 30 years old when he began his reign; he reigned 40 years.

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.

1 Chronicles 3:4

Six sons were born to David in Hebron, where he ruled seven years and six months, and he ruled in Jerusalem 33 years.

Treasury of Scripture Knowledge

Summary

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.

Bible References

Forty years

1 Chronicles 3:4
Six sons were born to David in Hebron, where he ruled seven years and six months, and he ruled in Jerusalem 33 years.
2 Samuel 5:4
David was 30 years old when he began his reign; he reigned 40 years.
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.

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.