2 Samuel 20:6-8

6Then David said to Abishai, “Sheba son of Bicri is going to hurt us more than Absalom did. Quick, take my troops and chase after him before he gets into a fortified town where we can’t reach him.”

7So Abishai and Joab, together with the king’s bodyguard and all the mighty warriors, set out from Jerusalem to go after Sheba.

8As they arrived at the great stone in Gibeon, Amasa met them. Joab was wearing his military tunic with a dagger strapped to his belt. As he stepped forward to greet Amasa, he slipped the dagger from its sheath.