2 Samuel 20:6-8

6 David said to Abishai, “Sheba son of Bicri is more dangerous to us than Absalom was. Take my men and chase him. Hurry before he finds strong, walled cities. If he gets there, he will escape from us.”

7 So Joab’s men, the Kerethites and the Pelethites, who were the king’s bodyguards, and all the soldiers went with Abishai. They went out from Jerusalem to chase Sheba son of Bicri.

8 When Joab and the army came to the great rock at Gibeon, Amasa came out to meet them. Joab was wearing his uniform. At his waist he wore a belt. It held his sword in its case. As Joab stepped forward, his sword fell out of its case.