2 Samuel 20:8-10

8And while they were at the great stone in Gibeon, Amasa joined them.

Now Joab was dressed in military attire, with a dagger strapped to his belt. And as he stepped forward, he slipped the dagger from its sheath.1 9“Are you well, my brother?” Joab asked Amasa. And with his right hand Joab grabbed Amasa by the beard to kiss him.

10Amasa was not on guard against the dagger in Joab’s hand, and Joab stabbed him in the stomach and spilled out his intestines on the ground. And Joab did not need to strike him again, for Amasa was dead. Then Joab and his brother Abishai pursued Sheba son of Bichri.