So David and Abishai came to the people by night: and, behold, Saul lay sleeping within the camp, and his spear stuck in the ground at his head: but Abner and the people lay round about him.
Read Chapter 26
Basil the Great
If Saul had been asked the reason for his hostility, he would have been compelled to admit that it was the favors received from David’s hand. Moreover, even though Saul had been found asleep by David during the very time that the latter was being pursued, and although Saul lay, an easy victim, before his enemy, his life was again spared by that just man, for he refrained from doing him violence. - "Concerning Envy"