Jamieson, Fausset and Brown on Romans 8:23

23. And not only they, but ourselves also--or "not only [so], but even we ourselves"--that is, besides the inanimate creation.

which have the first-fruits of the Spirit--or, "the Spirit as the first-fruits" of our full redemption (compare 2Co 1:22), moulding the heart to a heavenly frame and attempering it to its future element.

even we ourselves--though we have so much of heaven already within us.

groan within ourselves--under this "body of sin and death," and under the manifold "vanity and vexation of spirit" that are written upon every object and every pursuit and every enjoyment under the sun.

waiting for the--manifestation of our

adoption, to wit, the redemption of our body--from the grave: "not (be it observed) the deliverance of ourselves from the body, but the redemption of the body itself from the grave" [Bengel].