Absalom had made Amasa captain of the army instead of Joab. Amasa was the son of a man named Jether the Ishmaelite. Amasa’s mother was Abigail daughter of Nahash and sister of Zeruiah, Joab’s mother.
When Abner arrived at Hebron, Joab took him aside into the gateway. He acted as though he wanted to talk with Abner in private, but Joab stabbed him in the stomach, and Abner died. Abner had killed Joab’s brother Asahel, so Joab killed Abner to pay him back.
So Jezebel sent a messenger to Elijah, saying, “May the gods punish me terribly if by this time tomorrow I don’t kill you just as you killed those prophets.”
Then the Spirit entered Amasai, the leader of the Thirty, and he said: “We belong to you, David. We are with you, son of Jesse. Success, success to you. Success to those who help you, because your God helps you.” So David welcomed these men and made them leaders of his army.
And where you die, I will die, and there I will be buried. I ask the Lord to punish me terribly if I do not keep this promise: Not even death will separate us.”