And he brought out the people that were in it, and cut them with saws, and with harrows of iron, and with axes. Even so dealt David with all the cities of the children of Ammon. And David and all the people returned to Jerusalem.

Jamieson-Fausset-Brown Bible Commentary

3. cut them with saws, &c.-The Hebrew word, "cut them," is, with the difference of the final letter, the same as that rendered "put them," in the parallel passage of Samuel [2Sa 12:31]; and many consider that putting them to saws, axes, and so forth, means nothing more than that David condemned the inhabitants of Rabbah to hard and penal servitude.

Matthew Henry's Concise Commentary

20:1-8 David's wars. - Though the Lord will severely correct the sins of his believing people, he will not leave them in the hands of their enemies. His assistance will overcome all advantages of number and strength of those that defy his Israel. All that trust in Christ, shall be made more than conquerors through him that loveth them.

Matthew Henry's Whole Bible Commentary

Chapter 20

Here is a repetition of the story of David's wars, I. With the Ammonites, and the taking of Rabbah (v. 1-3). II. With the giants of the Philistines (v. 4-8).

Verses 1-3

How the army of the Ammonites and their allies was routed in the field we read in the foregoing chapters. Here we have the destruction of Rabbah, the metropolis of their kingdom (v. 1), the putting of their king's crown upon David's head (v. 2), and the great severity that was used towards the people, v. 3. Of this we had a more full account in 2 Sa. 11, 12, and cannot but remember it by this sad token, that while Joab was besieging Rabbah David fell into that great sin in the matter of Uriah. But it is observable that, though the rest of the story is repeated, that is not: a hint only is given of it, in those words which lie here in a parenthesis-But David tarried at Jerusalem. If he had been abroad with his army, he would have been out of the way of that temptation; but, indulging his ease, he fell into uncleanness. Now, as the relating of the sin David fell into is an instance of the impartiality and fidelity of the sacred writers, so the avoiding of the repetition of it here, when there was a fair occasion given to speak of it again, is designed to teach us that, though there may be a just occasion to speak of the faults and miscarriages of others, yet we should not take delight in the repetition of them. That should always be looked upon as an unpleasing subject which, though sometimes one cannot help falling upon, yet one would not choose to dwell upon, any more than we should love to rake in a dunghill. The persons, or actions, we can say no good of, we had best say nothing of.