back, i.e., those who turn back, as in Exo 23:27. From Psa 21:13 (תּשׁיתמו שׁכם, Symm. τάξεις αὐτοὺς ἀποστρόφους) it becomes clear that ערף is not an accusative of the member beside the accusative of the person (as e.g., in Deu 33:11), but an accusative of the factitive object according to Ges. §139, 2.
Verses 41-42
Psa 18:41-42 (Hebrew_Bible_18:42-43) Their prayer to their gods, wrung from them by their distress, and even to Jahve, was in vain, because it was for their cause, and too late put up to Him. על = על; in Psa 42:2 the two prepositions are interchanged. Since we do not pulverize dust but to dust, כּעפר is to be taken as describing the result: so that they became as dust (cf. Job 38:30, כּאכן, so that it is become like stone, and the extreme of such pregnant brevity of expression in Isa 41:2) before the wind (על־פּני as in 2Ch 3:17, before the front). The second figure is to be explained differently: I emptied them out (אריקם from הריק) like the dirt of the streets, i.e., not merely: so that they became such, but as one empties it out, - thus contemptuously, ignominiously and completely (cf. Isa 10:6; Zec 10:5). The lxx renders it λεανῶ from הרק (root רק to stretch, make thin, cf. tendo tenius, dehnen dünn); and the text of 2 Sam 22 present the same idea in אדיקם.
Verses 43-45
Psa 18:43-45 (Hebrew_Bible_18:44-46) Thus victorious in God, David became what he now is, viz., the ruler of a great kingdom firmly established both in home and foreign relations. With respect to the גּוים and the verb תּפלּטני which follows, ריבי עם can only be understood of the conflicts among his own people, in which David was involved by the persecution of Saul and the rebellions of Absolom and Sheba the son of Bichri; and from which Jahve delivered him, in order to preserve him for his calling of world-wide dominion in accordance with the promise. We therefore interpret the passage according to בּרית עם in Isa 49:8, and קנאת־עם in Isa 26:11; whereas the following עם comes to have a foreign application by reason of the attributive clause לא־ידעתּי (Ges. §123, 3). The Niph. נשׁמע in Psa 18:45 is the reflexive of שׁמע, to obey (e.g., Exo 24:7), and is therefore to be rendered: show themselves obedient (= Ithpa. in Dan 7:27). לשׁמע אזן implies more than that they obeyed at the
