Commentaries
12:26-31 To be thus severe in putting the children of Ammon to slavery was a sign that David's heart was not yet made soft by repentance, at the time when this took place. We shall be most compassionate, kind, and forgiving to others, when we most feel our need of the Lord's forgiving love, and taste the sweetness of it in our own souls.
2Sa 12:26-31. Rabbah Is Taken.
26. Joab fought against Rabbah—The time during which this siege lasted, since the intercourse with Bath-sheba, and the birth of at least one child, if not two, occurred during the progress of it, probably extended over two years.