2 Samuel 5:3-5

Young's Literal Translation

³ And all the elders of Israel come unto the king, to Hebron, and king David maketh with them a covenant in Hebron before Jehovah, and they anoint David for king over Israel.

⁴ A son of thirty years [is] David in his being king; forty years he hath reigned;

⁵ in Hebron he reigned over Judah seven years and six months, and in Jerusalem he reigned thirty and three years, over all Israel and Judah.