John Wesley on 1 Samuel 30:13

Egypt - God by his providence so ordering it, that he was not one of that cursed race of the Amalekites, who were to be utterly destroyed, but an Egyptian, who might be spared. Left me - In this place and condition: which was barbarous inhumanity: for he ought, and easily might have carried him away with the prey which they had taken. But he paid dear for this cruelty, for this was the occasion of the ruin of him and all their company. And God by his secret providence ordered the matter thus for that very end. So that there is no fighting against God, who can make the smallest accidents serviceable to the production of the greatest effects.