2Sa 2 Samuel, chapter Second Book of Samuel, chapter 20
And 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. Jos 10:41