Appeal is next made in God's promises. Some suppose that a Divine oracle had been recently given to David himself, and that he here records the words of it. But, in that case, it is difficult to account for the despondent tone of Psalms 60:1-4.
Hengstenberg's explanation seems preferable, that David now encourages himself by a "reference to the general aspect of the assurances given in the Pentateuch in regard to the possession of the land of Canaan in its widest extent, and to victory over hostile neighbours," and that he has his eye especially on the blessing of Jacob (Genesis 49:1-33) and the blessing of Moses (Deuteronomy 33:1-29).
If these assurances are to be depended on, Israel cannot now be about to succumb to Edom.