2 Samuel 20:9-10

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.