2 Samuel 5:4

David was thirty years old when he became king. He ruled for forty years.

1 Chronicles 26:31

As for the Hebronites, Jeriah was their chief according to the genealogical records of their families. In the fortieth year of David's reign a search was made in the records, and capable men among the Hebronites were found at Jazer in Gilead.

1 Chronicles 29:27

for forty years. He ruled in Hebron for seven years and in Jerusalem for thirty-three.

Luke 3:23

When Jesus began to teach he was about thirty years old. Jesus was the son of Joseph, the son of Heli,

1 Kings 2:11

He was king of Israel for forty years. He ruled seven years in Hebron and thirty-three years in Jerusalem.

1 Chronicles 3:4

These six were born to David in Hebron, where he reigned seven years and six months. David reigned in Jerusalem thirty-three years,

Treasury of Scripture Knowledge

Summary

David was thirty years old when he began to reign, and he reigned forty years.

Thirty

Bible References

Thirty

Luke 3:23
When Jesus began to teach he was about thirty years old. Jesus was the son of Joseph, the son of Heli,

Forty

1 Chronicles 26:31
As for the Hebronites, Jeriah was their chief according to the genealogical records of their families. In the fortieth year of David's reign a search was made in the records, and capable men among the Hebronites were found at Jazer in Gilead.
1 Chronicles 29:27
for forty years. He ruled in Hebron for seven years and in Jerusalem for thirty-three.