9 Joab said to Amasa, Is it well with you, my brother? Joab took Amasa by the beard with his right hand to kiss him.
10 But Amasa took no heed to the sword that was in Joab's hand: so he struck him therewith in the body, and shed out his bowels to the ground, and didn't strike him again; and he died. Joab and Abishai his brother pursued after Sheba the son of Bichri.
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Commentary on 2 Samuel 20 Matthew Henry Commentary
Chapter 20
How do the clouds return after the rain! No sooner is one of David's troubles over than another arises, as it were out of the ashes of the former, wherein the threatening is fulfilled, that the sword should never depart from his house.
2Sa 20:1-3
David, in the midst of his triumphs, has here the affliction to see his kingdom disturbed and his family disgraced.
2Sa 20:4-13
We have here Amasa's fall just as he began to rise. He was nephew to David (ch. 17:25), had been Absalom's general and commander-in-chief of his rebellious army, but, that being routed, he came over into David's interest, upon a promise that he should be general of his forces instead of Joab. Sheba's rebellion gives David an occasion to fulfil his promise sooner than he could wish, but Joab's envy and emulation rendered its fulfillment of ill consequence both to him and David.
2Sa 20:14-22
We have here the conclusion of Sheba's attempt.
2Sa 20:23-26
Here is an account of the state of David's court after his restoration. Joab retained the office of general, being too great to be displaced. Benaiah, as before, was captain of the guards. Here is one new office erected, which we had not (ch. 8:16-18), that of treasurer, or one over the tribute, for it was not till towards the latter end of his time that David began to raise taxes. Adoram was long in this office, but it cost him his life at last, 1 Ki. 12:18.