2 Samuel 20:5

He tarried longer than the set time. But not longer than was to be expected. For the appointment was so surprising that everybody must have been agape with astonishment. They would naturally have expected that Amasa would he punished. Instead of this, he is commissioned to gather the militia in David's name. And men would hesitate about joining such a leader. Was he really loyal? or would he embark them in a new rebellion? And what would Joab do? He was not a man likely to bear such a slight tamely, and David ought to have foreseen that he was sowing for himself a crop of discord and enmity.