1 Kings 2:11

David had reigned over Israel for 40 years. He reigned in Hebron for seven years and in Jerusalem for 33 years.

2 Samuel 5:4-5

David began to reign when he was 30 years old, and he reigned 40 years.

1 Chronicles 29:26-27

Jesse's son David reigned as king over all of 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 began to reign when he was 30 years old, and he reigned 40 years.
1 Chronicles 29:26
Jesse's son David reigned as king over all of Israel,

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