Matthew Henry on 2 Samuel 3:1-6
Here is, I. The struggle that David had with the house of Saul before his settlement in the throne was completed, Sa2 3:1. 1. Both sides contested. Saul's house, though beheaded and diminished, would not fall tamely. It is not strange between them, but one would wonder it should be a long war, when David's house had right on its side, and therefore God on its side; but, though truth and equity will triumph at last, God made for wise and holy ends prolonged the conflict. The length of this war tried the faith and patience of David, and made his establishment at last the more welcome to him. 2. David's side got ground. The house of Saul waxed weaker and weaker, lost places, lost men, sunk in i…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Samuel 3:5
Eglah David's wife--This addition has led many to think that Eglah was another name for Michal, the first and proper wife, who, though she had no family after her insolent ridicule of David (Sa2 6:23), might have had a child before.
Adam Clarke on 2 Samuel 3:1
There was long war - Frequent battles and skirmishes took place between the followers of David and the followers of Ish-bosheth, after the two years mentioned above, to the end of the fifth year, in which Ish-bosheth was slain by Rechab and Baanah.
John Gill on 2 Samuel 3:5
And the sixth, Ithream, by Eglah David's wife,.... Who also is not spoken of in any other place; only, in a like chronological account as the former, it is remarked that the mother of this only is called David's wife; the reason of which is supposed to be, either because she was a person of no note, and had nothing else to distinguish her; but the same may be said of the two foregoing; or because she was his beloved wife, his heifer, as her name signifies; hence the Jews (y) take her to be Michal his first wife, whom he greatly loved, and who, though she had no children after her contempt of David for playing before the ark, unto the day of her death, yet might have before: but it should be…