1 Samuel 24:3-5

3He came to the sheep pens along the way; a cave was there, and Saul went in to relieve himself. David and his men were far back in the cave.

4The men said, “This is the day the Lord spoke of when he said to you, ‘I will give your enemy into your hands for you to deal with as you wish.’ ” Then David crept up unnoticed and cut off a corner of Saul’s robe.

5Afterward, David was conscience-stricken for having cut off a corner of his robe.