Jamieson, Fausset and Brown on Romans 7:24

24. O wretched man that I am! who shall deliver me from the body of this death?--The apostle speaks of the "body" here with reference to "the law of sin" which he had said was "in his members," but merely as the instrument by which the sin of the heart finds vent in action, and as itself the seat of the lower appetites (see on Ro 6:6, and Ro 7:5); and he calls it "the body of this death," as feeling, at the moment when he wrote, the horrors of that death (Ro 6:21, and Ro 7:5) into which it dragged him down. But the language is not that of a sinner newly awakened to the sight of his lost state; it is the cry of a living but agonized believer, weighed down under a burden which is not himself, but which he longs to shake off from his renewed self. Nor does the question imply ignorance of the way of relief at the time referred to. It was designed only to prepare the way for that outburst of thankfulness for the divinely provided remedy which immediately follows.