2 Samuel 20:6-8

6 David said to Abishai, “Sheba son of Bicri is more dangerous to us than Absalom was. So take my officers and chase Sheba. Hurry before he gets into cities with walls. If he gets into the well-protected cities, we will not be able to get him.”

7 So Joab took the Kerethites and Pelethites[81] and the other soldiers with him and left Jerusalem to chase after Sheba son of Bicri.

8 When Joab and the army came to Big Rock at Gibeon, Amasa came out to meet them. Joab was wearing his uniform with a belt that held a knife. As he walked toward Amasa, the knife on the belt came out.