2 Samuel 20:6-8

6And David said to Abishai [his nephew], “Now Sheba the son of Bichri will do us more harm than Absalom did. Take your lord’s servants and pursue him, so that he does not find fortified cities for himself and escape from our sight.”

7So Joab’s men went after him, along with [David’s bodyguards] the Cherethites and Pelethites and all the warriors; they went out from Jerusalem to pursue Sheba the son of Bichri.

8When they were at the great stone in Gibeon, Amasa came to meet them. Now Joab was wearing his military uniform, and over it he had a belt with a sheathed sword strapped around his hips; and as he went forward, it fell out.