We have here an account of the conquest of Rabbah, and other cities of the Ammonites. Though this comes in here after the birth of David's child, yet it is most probable that it was effected a good while before, and soon after the death of Uriah, perhaps during the days of Bath-sheba's mourning for him. Observe, 1. That God was very gracious in giving David this great success against his enemies, notwithstanding the sin he had been guilty of just at that time when he was engaged in this war, and the wicked use he had made of the sword of the children of Ammon in the murder of Uriah. Justly might he have made that sword, thenceforward, a plague to David and his kingdom; yet he breaks it, and makes David's sword victorious, even before he repents, that this goodness of God might lead him to repentance. Good reason had David to own that God dealt not with him according to his sins, Psa 103:10. 2. That Joab acted very honestly and honourably; for when he had taken the city of waters, the royal city, where the palace was, and from which the rest of the city was supplied with water (and therefore, upon the cutting off of that, would be obliged speedily to surrender), he sent to David to come in person to complete this great action, that he might have the praise of it, Sa2 12:26-28. Herein he showed himself a faithful servant, that sought his master's honour, and his own only in subordination to his, and left an example to the servants of the Lord Jesus, in every thing they do, to consult his honour. Not unto us, but to thy name, give glory. 3. That David was both too haughty and too severe upon this occasion, and neither so humble nor so tender as he should have been. (1.) He seems to have been too fond of the crown of the king of Ammon, Sa2 12:30. Because it was of extraordinary value, by reason of the precious stones with which it was set, David would have it set upon his head, though it would have been better to have cast it at God's feet, and at this time to have put his own mouth in the dust, under guilt. The heart that is truly humbled for sin is dead to worldly glory and looks upon it with a holy contempt. (2.) He seems to have been too harsh with his prisoners of war, Sa2 12:31. Taking the city by storm, after it had obstinately held out against a long and expensive siege, if he had put all whom he found in arms to the sword in the heat of battle, it would have been severe enough; but to kill them afterwards in cold blood, and by cruel tortures, with saws and harrows, tearing them to pieces, did not become him who, when he entered upon the government, promised to sing of mercy as well as judgment, Psa 101:1. Had he made examples of those only who had abused his ambassadors, or advised or assisted in it, that being a violation of the law of nations, it might have been looked upon as a piece of necessary justice for terror to other nations; but to be thus severe with all the cities of the children of Ammon (that is, the garrisons or soldiers of the cities) was extremely rigorous, and a sign that David's heart was not yet made soft by repentance, else the bowels of his compassion would not have been thus shut up - a sign that he had not yet found mercy, else he would have been more ready to show mercy.

And have taken the city of waters - The city where the tank or reservoir was that supplied the city and suburbs with water. Some think that the original, לכדתי את עיר המים lachadti eth ir hammayim, should be translated I have intercepted, or cut off, the waters of the city: and Houbigant translates the place, et aquas ab urbe jam derivavi; "And I have already drawn off the waters from the city." This perfectly agrees with the account in Josephus, who says των τε ὑδατων αυτους αποτεμνομενος, having cut off their waters, Antiq., lib. vii., cap. 7. This was the reason why David should come speedily, as the citadel, deprived of water, could not long hold out.

And David gathered all the people together,.... The soldiers that were with him, or near him; which was done partly to recruit Joab's troops, who, by the continuance of the siege, and the sallies of the enemy on them, might be greatly diminished; and partly to make conquests of other cities of the Ammonites, and to carry off the spoil of them:

and went to Rabbah; which must be after the death of Uriah, and very probably during the time of Bathsheba's mourning for him:

and fought against it, and took it; by assault.

encamp against the city, and take it--It has always been characteristic of Oriental despots to monopolize military honors; and as the ancient world knew nothing of the modern refinement of kings gaining victories by their generals, so Joab sent for David to command the final assault in person. A large force was levied for the purpose. David without much difficulty captured the royal city and obtained possession of its immense wealth.

lest I take the city, and it be called after my name--The circumstance of a city receiving a new name after some great person, as Alexandria, Constantinople, Hyderabad, is of frequent occurrence in the ancient and modern history of the East.