1 Samuel 24:20

And now, behold, I know well that thou shalt surely be king, and that the kingdom of Israel shall be established in thine hand.

Ver. 20. And now, behold, I know well.] How knew he this? Nimirum ex ipsis Davidis moribus, saith Chrysostom. Surely by David's kingly virtues, and good success, whereby God made him formidable to his enemies, but amiable and admirable in the eyes of all Israel. Saul's sin therefore was the greater in persecuting David, whom he knew God had set up. See Psalms 4:2,4 .