O God! be not far from me. It is scarcely possible to express how severe and hard a temptation it was to David, when he knew that the wicked entertained the persuasion that he was rejected of God. They did not without consideration circulate this report; but after having seemed wisely to weigh all circumstances, they gave their judgment on the point as of a thing which was placed beyond all dispute. It was therefore an evidence of heroic fortitude on the part of David, thus to rise superior to their perverse judgments, and, in the face of them all, to assure himself that God would be gracious to him, and to betake himself familiarly to him. Nor is it to be doubted that, in calling God his God, he makes use of this as a means of defending himself from this hard and grievous assault. While invoking the aid of God, he at the same time prays (verse 13) that his enemies may be filled with shame until they be consumed. These words, however, may not improperly be read in the future tense; for it is frequently the practice of David, after having ended his prayer, to rise up against his enemies, and, as it were, to triumph over them. But I have followed that which seems more agreeable to the scope of the passage. Having had occasion elsewhere to explain this imprecation, it is unnecessary for me to repeat, in this place, what I have previously said.

O God, be not far from me - See the notes at Psalm 22:11.
O my God, make haste for my help - See the notes at Psalm 40:13.

O God, be not far from me: O (i) my God, make haste for my help.
(i) In calling him his God, he puts back the false reports of the adversaries who said God had forsaken him.

O God, be not far from me,.... God is everywhere, at hand and afar off, with regard to his being, power, and providence; his glorious presence is in heaven, his gracious presence is with his people; but, when he hides his face, he seems to be at a distance; and this they cannot bear, and therefore deprecate it; see Psalm 10:1;
O my God, make haste for my help; he knew that his help was in God, and that there was none for him elsewhere; and that he could help him when none else could, and was a present help in time of trouble; and it being such a time with him, and his case desperate, he desires the Lord that he would make haste; and he addresses him as his own God, the consideration of which encouraged his faith and hope in him, and carried in it an argument to help him; see Psalm 119:94.

(Compare Psalm 22:19; Psalm 40:4).