(11) One of Joab's man.--Com. 2 Samuel 20:7. Time was too precious for Joab himself to wait. He must put down the rebellion of Sheba by rapid action, and thereby render himself impregnable in the high office which had been his, and which he had now again usurped. He left one of his trusty men, however, by the body of Amasa, with a battle cry which should suggest that he had rightly been put to death for his doubtful loyalty, and that all who were attached to Joab and loyal to David should follow Joab. Joab's real motive for murdering Amasa, as for murdering Abner (2 Samuel 3:27), was personal jealousy and ambition.
Verse 11. - One of Joab's men. Joab left one of his personal followers to prevent any halt of the people round Amasa's body, and to suggest that he was a traitor. For he was to say to them as they came up, not only that "whosoever had pleasure in Joab," but also that "all who were for David, were to go after Joab." All loyal men were to regard him as captain of the host, and to disobey him would be rebellion. Naturally they would conclude from this that Amasa had not really been true to David, and that his death was the punishment inflicted on him for his past guilt.
20:4-13 Joab barbarously murdered Amasa. The more plot there is in a sin, the worse it is. Joab contentedly sacrificed the interest both of the king and the kingdom to his personal revenge. But one would wonder with what face a murderer could pursue a traitor; and how, under such a load of guilt, he had courage to enter upon danger: his conscience was seared.
And one of Joab's men stood by him,.... By the body of Amasa; no doubt by the order of Joab, to satisfy the people as they came up, and reconcile them to this fact, and to exhort them not to stop, but to follow after Joab; for though Amasa their general was dead, Joab had taken the command of the army, and the pursuit was carried on with as much rigour as ever:
and said, he that favoureth Joab, and he that is for David, let him go after Joab: he that likes Joab should be general, and is in the interest of David, let him make no stay here, but follow after Joab; Joab and David are put together, as if their interests were the same; though there seems to be an indecency in placing Joab first.
and said, he that favoureth Joab, and he that is for David, let him go after Joab: he that likes Joab should be general, and is in the interest of David, let him make no stay here, but follow after Joab; Joab and David are put together, as if their interests were the same; though there seems to be an indecency in placing Joab first.