Carl Friedrich Keil and Franz Delitzsch Old Testament Commentary
The third strophe reverts to prayer; but the prayer now breathes more freely with a self-conscious courage for the strife. The fortified city (עיר מצור) is not Rabbath Ammon; but, as becomes evident from the parallel member of the verse and Kg2 14:7, the Idumaean chief city of Sela' (סלע) or Petra (vid., Knobel on Gen 36:42, cf. Psa 31:22; Ch2 8:5; Ch2 11:5 together with Psa 14:5). The wish: who will conduct me = Oh that one would conduct me (Ges. 136, 1)! expresses a martial desire, joyful at the prospect of victory; concerning מי נחני, quis perduxerit me, vid., on Psa 11:3. What follows is not now to be rendered: Not Thou (who but Thou), Elohim, who...(Hitzig) - for in order to have been understood thus and not as in Psa 60:3, Psa 44:10, the poet could not have omitted אשׁר - on the contrary, the interrogatory הלא is the foundation on which the supplicatory הבה is raised. The king of Israel is hard pressed in the battle, but he knows that victory comes from above, from the God who has hitherto in anger refused it to His people, inasmuch as He has given power to Edom to break through the defensive forces of Israel (vid., Psa 44:10). עזרת (not עזרת = עזרה) is, as in Psa 108:13, equivalent to עזרתה. The view that it is equal to עזרתי, the suffix being cast away, is not confirmed in this instance, vid., on Psa 16:6, cf. Psa 3:3. How vain is human succour, has been seen only very recently in the case of the kings of Zobah and Ammon, who have succumbed in spite of their confederates. Israel prays for its victorious power from above, and also obtains it thence, as is most confidently expressed in v. 14. עשׂה חיל, to do valiantly, to show valour, is equivalent to: to be victorious, as in Psa 118:16. In God does Israel conquer, and God, who is in Israel, will by means of Israel tread down Edom in accordance with its deserts.
Jamieson-Fausset-Brown Bible Commentary
He feels assured that, though once angry, God is now ready to favor His people.
who will lead me-- or, who has led me, as if the work were now begun.
John Gill Bible Commentary
Who will bring me into the strong city?.... Which some understand of Rabbah of the Ammonites, which Joab besieged, and sent to David to come and take it in person, Sa2 12:26. The Targum interprets it of Tyre, which was a strong fortified city, Eze 26:4. It rather seems to be the same with Edom, or the metropolis of the Edomites; since it follows:
who will lead me into Edom? which was situated in the clefts of the rock, and on the height of the hill, Jer 49:16; but is mystically to be understood of the city of Rome, the great and mighty city, as it is often called in the book of the Revelation, Rev 11:8; whose destruction is certain, being predicted; and after which there have been desires raised in the hearts of God's people in all ages; and particularly just before the time God will put it into the hearts of the kings of the earth to burn it with fire; who are here represented by David, as desirous of entering into it in triumph to destroy it, Rev 17:16.
Tyndale Open Study Notes
60:9 Destroying a defeated invader’s capital (the fortified city) would help to ensure that they would not attack again. The capital of Edom was Bozrah, located to the southeast of Israel. Only God could grant victory.