26 And Joab fought against Rabbah of the children of Ammon, and took the royal city. 27 And Joab sent messengers to David, and said, I have fought against Rabbah, and have taken the city of waters. 28 And now gather the rest of the people, and encamp against the city and take it: lest I take the city and it be called by my name. 29 And David gathered all the people, and went to Rabbah, and fought against it and took it. 30 And he took the crown of their king from off his head, the weight of which was a talent of gold with [the] precious stones; and it was [set] on David's head; and he brought forth the spoil of the city in great abundance. 31 And he brought out the people that were in it, and put them under the saw, and under harrows of iron, and under axes of iron, and made them pass through the brickkilns. And so did he to all the cities of the children of Ammon. And David and all the people returned to Jerusalem.
Matthew Henry's Commentary on 2 Samuel 12:26-31
Commentary on 2 Samuel 12:26-31
(Read 2 Samuel 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.