David became the king of all the Israeli tribes

5 Then the leaders of all the tribes of Israel came to David at Hebron, and said to him, “Listen, we have the same ancestors [IDM] that you do. 2 In the past, when Saul was our king, it was you who led our Israeli soldiers in our battles. You are the one to whom Yahweh promised, ‘You will be the leader [MET] of my people; you will be their king.’ ”

3 So while Yahweh was listening, all those leaders of the people of Israel declared there at Hebron that David would be their king. And David made a sacred agreement with them. They anointed him with olive oil to set him apart to be the king of the Israeli people. 4 David was 30 years old when he became their king. He ruled them for 40 years. 5 In Hebron he ruled over the tribe of Judah for seven and a half years, and in Jerusalem he ruled over all the people of Judah and Israel for 33 years.