So Amasa went to summon Judah; but he delayed beyond the set time that had been appointed him.
David said to Abishai, "Now Sheba son of Bichri will do us more harm than Absalom; take your lord's servants and pursue him, or he will find fortified cities for himself, and escape from us."
Joab's men went out after him, along with the Cherethites, the Pelethites, and all the warriors; they went out from Jerusalem to pursue Sheba son of Bichri.
When they were at the large stone that is in Gibeon, Amasa came to meet them. Now Joab was wearing a soldier's garment and over it was a belt with a sword in its sheath fastened at his waist; as he went forward it fell out.
Joab said to Amasa, "Is it well with you, my brother?" And Joab took Amasa by the beard with his right hand to kiss him.
But Amasa did not notice the sword in Joab's hand; Joab struck him in the belly so that his entrails poured out on the ground, and he died. He did not strike a second blow. Then Joab and his brother Abishai pursued Sheba son of Bichri.
And one of Joab's men took his stand by Amasa, and said, "Whoever favors Joab, and whoever is for David, let him follow Joab."
Amasa lay wallowing in his blood on the highway, and the man saw that all the people were stopping. Since he saw that all who came by him were stopping, he carried Amasa from the highway into a field, and threw a garment over him.
Once he was removed from the highway, all the people went on after Joab to pursue Sheba son of Bichri.
Sheba passed through all the tribes of Israel to Abel of Beth-maacah; and all the Bichrites assembled, and followed him inside.
References for 2 Samuel 20:14
Joab's forces came and besieged him in Abel of Beth-maacah; they threw up a siege ramp against the city, and it stood against the rampart. Joab's forces were battering the wall to break it down.
References for 2 Samuel 20:15