King James Version

2 Samuel 5:4 KJV

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

2 Samuel 5 — Context

2 Samuel 5:3 — “So all the elders of Israel came to the king to Hebron; and king David made a league with them in Hebron before the LORD...
2 Samuel 5:4 — “David was thirty years old when he began to reign, and he reigned forty years.
2 Samuel 5:5 — “In Hebron he reigned over Judah seven years and six months: and in Jerusalem he reigned thirty and three years over all ...

Study 2 Samuel 5:4