But Yahweh said to Samuel, "Don't look on his face, or on the height of his stature; because I have rejected him: for [Yahweh sees] not as man sees; for man looks at the outward appearance, but Yahweh looks at the heart."
Now that shows you how far Saul has strayed from the Lord, and the things of the Lord, he would actually kill the prophet of God. Samuel realized this, "This guy is really gone off the deep end. Lord if he hears I'm going to go down and anoint another king, he's gonna kill me."