'King of Israel' in the Bible

And said to him, Have no fear, for Saul my father will not get you into his power; and you will be king of Israel, and I will be by your side, and my father Saul is certain of this.

After whom has the king of Israel come out? for whom are you searching? for a dead dog, an insect.

Then do not let my blood be drained out on the earth away from the face of the Lord: for the king of Israel has come out to take my life, like one going after birds in the mountains.

Then the rulers of the Philistines said, What are these Hebrews doing here? And Achish said to the rulers of the Philistines, Is this not David, the servant of Saul the king of Israel, who has been with me for a year or two, and I have never seen any wrong in him from the time when he came to me till now?