2 Samuel 2:1-11
And it came to pass after this, that David inquired of the LORD, saying, Shall I go up into any of the cities of Judah? And the LORD said to him, Go up. And David said, Where shall I go up? And he said, To Hebron.
Nave's Topical Index—AKJV

2 Samuel 5:4,5
David was thirty years old when he began to reign, and he reigned forty years.
Nave's Topical Index—AKJV