1 Samuel 24:4-6 [Read also Psalms 57 and 142]
24:3 Saul went in to cave (where David and his men were hiding) to relieve himself.

24:4 The men said, “This is the day the LORD spoke of when he said to you, ‘I will give your enemy [Saul obviously in a vulnerable position] into your hands for you to deal with as you wish.’” Then David crept up unnoticed [quietly] and cut off a corner of Saul’s robe [evidence that he could have cut off Saul’s life but chose not to do so].

24:5 Afterward, David was conscience-stricken [indicates respect David had for Saul as “the anointed of the Lord” (v. 6)] for having cut off a corner of his robe.

24:6 He said to his men, “The LORD forbid that I should do such a thing to my master, the LORD’S anointed, or lift my hand against him [cf. 1 Sam. 24:12-13 re: David’s decision not to raise his hand against Saul]; for he is the anointed of the LORD [David trusted God to deal with Saul].”

24:8-15 David told Saul he could have killed him in the cave.

24:16-22 Saul acknowledged that David would one day be king.