2 Samuel 20:8-10

8When they were at the great stone that is in Gibeon, Amasa came to meet them. Now Joab was dressed in his military uniform, and over it was a belt with a sword in its sheath fastened on his waist; and as he stepped forward, it fell out.

9Then Joab said to Amasa, “Is it well with you my brother?” With his right hand Joab took Amasa by the beard to kiss him.

10But Amasa took no heed to the sword that was in Joab’s other hand. So he stabbed him with it in the groin and poured out his entrails to the ground, and did not strike him again, for he died. Then Joab and his brother Abishai pursued Sheba son of Bichri.