2 Samuel 5:3-5

3So all the elders of Israel came to the king at Hebron, and King David 1made a covenant with them before the Lord in Hebron; then 2they anointed David king over Israel. 4David was 3thirty years old when he became king, and 4he reigned for forty years. 5At Hebron 5he reigned over Judah for seven years and six months, and in Jerusalem he reigned for thirty-three years over all Israel and Judah.