2 Samuel 20:7-10

7So Joab’s men, with the Cherethites, the Pelethites, and all the mighty men, went out after him. And they went out of Jerusalem to pursue Sheba the son of Bichri.

8When they were at the large stone which is in Gibeon, Amasa came before them. Now Joab was dressed in battle armor; on it was a belt with a sword fastened in its sheath at his hips; and as he was going forward, it fell out.

9Then Joab said to Amasa, “Are you in health, my brother?” And Joab took Amasa by the beard with his right hand to kiss him.

10But Amasa did not notice the sword that was in Joab’s hand. And he struck him with it in the stomach, and his entrails poured out on the ground; and he did not strike him again. Thus he died. Then Joab and Abishai his brother pursued Sheba the son of Bichri.