2 Samuel 20:8

8And while they were at the great stone in Gibeon, Amasa joined them.

Now Joab was dressed in military attire, with a dagger strapped to his belt. And as he stepped forward, he slipped the dagger from its sheath.20:8 Literally Now Joab was dressed in military attire, and over it was a belt around his waist with a dagger in its sheath. And as he stepped forward, it fell out.