Saul's robe

In chapter 24 from the book of 1 Samuel, Saul sent 3000 of his best men off in search of David.

All the while, David was hiding out in the caves.  Until one day, as happen chance, Saul decided to relieve himself on the road and it happened to be near a cave where David was hiding.

While Saul was preoccupied, David snuck up behind him and cut a piece of his robe.  Saul was scared, for David at any time could attack him.  But he didn't.

Saul came to the realization that David did not want to harm him at all.  He also knew David would be king one day.