The answer is: In a cave

1 Samuel 24:3-4

In the dramatic scene set in 1 Samuel 24, David's encounter with King Saul in a cave is rich with tension and significance. As you might recall, David was on the run from Saul, who viewed him as a threat to his throne. The cave served as a temporary sanctuary for David and his men, but it also became the stage for an intense emotional moment in a high-stakes conflict.

While hiding out in this cave, Saul unwittingly provided David with an opportunity. When David cut off a corner of Saul’s cloak, it wasn't just a simple act; it was a profound statement. The fringe of a garment held cultural significance in ancient Israel, symbolizing authority and the Divine covenant. By snipping this piece off, David symbolically highlighted the fragility of Saul's reign and the transition of power that was to come, while also demonstrating a choice driven by mercy over vengeance.

Interestingly, the imagery of a “corner of a cloak” connects to later themes in the Bible. The fringes on the edges of garments also appear in the Law, reminding people of their covenant with God (Numbers 15:37-41). In this moment, David refrained from taking Saul's life even when he had the chance, showcasing a deep respect for the position Saul held.

Their relationship is a complex blend of friendship, enemy, and mentor, setting a poignant backdrop for understanding kingship in biblical narratives. So, in this timeless story, we see themes of mercy, power dynamics, and respect for divine ordinations, which resonate throughout Scripture.