This was just a kid in Bethlehem, a shepherd and the baby of the family. But God had plans for David, plans to change the world forever. "this is the one!"

1 Samuel 16:12
So he sent and brought him in. Now he was ruddy, with bright eyes, and good-looking. And the Lord said, “Arise, anoint him; for this is the one!”
Bible Gateway link: 1 Samuel 16:12 (NKJV)