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; he reigned 40 years.

1 Chronicles 29:26-27

David son of Jesse was king over all Israel.

Treasury of Scripture Knowledge

Summary

And the days that David reigned over Israel were forty years: seven years reigned he in Hebron, and thirty and three years reigned he in Jerusalem.

Bible References

Reigned over

2 Samuel 5:4
David was 30 years old when he began his reign; he reigned 40 years.
1 Chronicles 29:26
David son of Jesse was king over all Israel.

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