Joab was over all the host - He had murdered Amasa, and seized on the supreme command: and such was his power at present, and the service which he had rendered to the state by quelling the rebellion of Sheba, that David was obliged to continue him; and dared not to call him to account for his murders without endangering the safety of the state by a civil war.
Benaiah - over the Cherethites - Benaiah was over the archers and slingers.
See the notes on 2 Samuel 8:18.
Now Joab - This is by no means an unmeaning repetition. Joab had been dismissed to make room for Amasa, and was now, as the result of his successful expedition against Sheba, and the death of Amasa, reinstated in his command. Moreover, this was a fresh beginning of David‘s reign, and therefore a statement of his chief officers is as proper as in 2 Samuel 8:16, when he had just established himself on the throne of Israel. Compare 1 Kings 4:2-6.
This chapter is based on 2 Samuel 24; 1 Kings 1; 1 Chronicles 21; 28; 29.
The overthrow of Absalom did not at once bring peace to the kingdom. So large a part of the nation had joined in revolt that David would not return to his capital and resume his authority without an invitation from the tribes. In the confusion that followed Absalom's defeat there was no prompt and decided action to recall the king, and when at last Judah undertook to bring back David, the jealousy of the other tribes was roused, and a counter-revolution followed. This, however, was speedily quelled, and peace returned to Israel. PP 746.1
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