While they were at the great rock in Gibeon,1 Amasa came to meet them. Joab2 was wearing his military tunic, and strapped over it at his waist was a belt with a dagger in its sheath. As he stepped forward, it dropped out of its sheath.
References for 2 Samuel 20:8
Joab said to Amasa, "How are you, my brother?" Then Joab took Amasa by the beard with his right hand to kiss him.
Amasa was not on his guard against the dagger3 in Joab's4 hand, and Joab plunged it into his belly, and his intestines spilled out on the ground. Without being stabbed again, Amasa died. Then Joab and his brother Abishai pursued Sheba son of Bicri.
References for 2 Samuel 20:10
One of Joab's men stood beside Amasa and said, "Whoever favors Joab, and whoever is for David, let him follow Joab!"
Amasa lay wallowing in his blood in the middle of the road, and the man saw that all the troops came to a halt5 there. When he realized that everyone who came up to Amasa stopped, he dragged him from the road into a field and threw a garment over him.
References for 2 Samuel 20:12