'King of Israel' in the Bible

After whom has the king of Israel come out? Whom do you pursue [with three thousand men]? A dead dog, a single flea?

Now then, do not let my blood fall to the ground away from the presence of the Lord; for the king of Israel has come out to search for a single flea, just as when one hunts a [defenseless] partridge in the mountains.”

the Philistine commanders [having noticed David] said, “What are these Hebrews doing here?” Achish said to the Philistine commanders, “Is this not David, the servant of Saul king of Israel, who has been with me these days and years, and I have found no fault in him from the day he deserted to me to this day?”