2 Samuel 20:7-10

7So Joab’s men, the Cherethites, the Pelethites, and all the warriors marched out under Abishai’s command; they left Jerusalem to pursue Sheba son of Bichri.

8They were at the great stone in Gibeon when Amasa joined them. Joab was wearing his uniform and over it was a belt around his waist with a sword in its sheath. As he approached, the sword fell out.

9Joab asked Amasa, “Are you well, my brother?” Then with his right hand Joab grabbed Amasa by the beard to kiss him.

10Amasa was not on guard against the sword in Joab’s hand, and Joab stabbed him in the stomach with it and spilled his intestines out on the ground. Joab did not stab him again, and Amasa died. Joab and his brother Abishai pursued Sheba son of Bichri.