The men of David said to him, Behold, the day of which Yahweh said to you, Behold, I will deliver your enemy into your hand, and you shall do to him as it shall seem good to you. Then David arose, and cut off the skirt of Saul's robe secretly.
This little incident provides another window into David’s thinking. David was acknowledging Yahweh’s sovereignty by submitting to His authority in setting Saul up as king (cf. Proverbs 24:21). David refused to take revenge for the trouble that Saul had caused him.